The Airbus A319 is a member of the Airbus A320 family of short- to medium-range, narrow-body, commercial passenger twin-engine jet airliners manufactured by Airbus. The A319 carries 124 to 156 passengers and has a maximum range of 3,700 nmi (6,900 km; 4,300 mi). Final assembly of the aircraft takes place in Hamburg, Germany and Tianjin, China. All of the A319's in the Delta fleet are ex NWA aircraft. The A319 is a shortened-fuselage variant of the Airbus A320 and entered service in April 1996 with Swissair, around two years after the stretched Airbus A321 and eight years after the original A320. The aircraft shares a common type rating with all other Airbus A320 family variants, allowing existing A320 family pilots to fly the aircraft without the need for further training. As of August 2019, a total of 1,480 Airbus A319 aircraft have been delivered, of which 1,436 are in service. In addition, another 42 airliners are on firm order (comprising 7 A319ceo and 35 A319neo). As of August 2019, American Airlines was the largest operator of the Airbus A319, operating 131 aircraft. In December 2010, Airbus announced a new generation of the A320 family, the A320neo (new engine option). The similarly shortened fuselage A319neo variant offers new, more efficient engines, combined with airframe improvements and the addition of winglets, named "sharklets" by Airbus. The aircraft promises fuel savings of up to 15%.

The A320 is one aircraft in four sizes (A318, A319, A320 and A321), representing the most successful and versatile jetliner family ever. Seating from 100 to 240 passengers and flying throughout the world – and landing on every continent – an A320 takes off or lands every 1.6 seconds. The A320 was the first fully digital fly-by-wire flight control system in a civil airliner, it was also the first to fully feature a "glass Cockpit". As the longest-range single-aisle aircraft, airlines and passengers alike have benefited from the A320’s exceptional efficiency and quality since its introduction, which has opened up exciting new travel possibilities throughout the world. Now with new engine options (NEO) available, the A320 Family continues to be the preferred choice for passengers and customers; setting the standard for the single-aisle market and securing its status as the world’s best-selling aircraft of all time. This is an aircraft that you can rely on. This is the aircraft that changed the game.

As the longest-fuselage member of Airbus’ best-selling, single-aisle A320 Family, the A321’s cabin offers passengers even more space in which to relax and enjoy the flight. Able to comfortably seat anywhere from a typical 170 to 200 passengers in a standard two-class cabin to 220 travellers in a more high-density layout, the A321 – with a wider cabin than any of its competitors – continues to define the meaning of single-aisle comfort in operations around the globe. Delta's first A321 , N301DV is registered in the honour of Capt. Dave Vorgias. Captain Vorgias was Delta's first line check pilot for the A321, and sadly passed away on February 3, 2017.

The Airbus A330 is a wide-body airliner made by Airbus. In the mid-1970s, Airbus conceived several derivatives of the A300, its first airliner, and developed the A330 twinjet in parallel with the A340 quadjet. In June 1987, Airbus launched both designs with their first orders. The A330-300, the first variant, took its maiden flight in November 1992 and entered service with Air Inter in January 1994. The slightly shorter A330-200 variant followed in 1998. In 2014, Airbus launched the A330neo, re-engined with Trent 7000 turbofans, which entered service in November 2018. The A330 shares its airframe with the early A340 variants, having two engines instead of four, two main landing gear legs instead of three, lower weights and slightly different lengths. Both airliners have fly-by-wire controls, which was first introduced on the A320, as well as a similar glass cockpit. The A330 was Airbus's first airliner to offer a choice of three engines: the General Electric CF6, Pratt & Whitney PW4000, or the Rolls-Royce Trent 700. The A330-300 has a range of 11,750 km or 6,350 nmi with 277 passengers, while the shorter A330-200 can cover 13,450 km or 7,250 nmi with 247 passengers. Later variants include the A330-200F dedicated freighter, the A330 MRTT military tanker, and the ACJ330 corporate jet. The A330 MRTT was proposed as the EADS/Northrop Grumman KC-45 for the US Air Force's KC-X competition, but lost to the Boeing KC-46 in appeal after an initial win. As of December 2019, A330 orders stand at 1,823 of which 1,492 have been delivered and 1,443 remain in operation. Its largest operator is Turkish Airlines with 68 aircraft. The A330 has allowed Airbus to expand its wide-body market share. It competes with the Boeing 767 and smaller variants of the 777 and the 787. It is complemented by the larger Airbus A350 XWB which succeeded the A340.

The A330neo is a true example of a highly-innovative aircraft that delivers superior quality and efficiency. As a member of Airbus’ family of wide-body jetliners, the A330neo benefits from continuous investment of over 150 million euro every year – integrating the latest developments from the A350 XWB and A380 Families to maintain its position as the best in its class, well ahead of its competition. The A330neo is powered by high-bypass ratio, new generation engines and designed with an advanced high-span wing vastly improving the aerodynamics. New materials have also been used across the wing including titanium pylon and composite nacelle. All these features combined, ensures that the A330neo has the lowest seat-mile cost of any mid-size wide-body and burns 25% less fuel burn than the previous generation competitors.

Delta was the first North American airline to take delivery of the A350 on July 13, 2017. The A350 was Delta's new flagship aircraft, replacing the Boeing 747 and primarily flying trans-Pacific routes. The most perfect designs often are found in nature. That’s why Airbus looks to learn from the natural world when designing and improving upon its aircraft. As the newest member of the company’s wide-body family, the A350 XWB is an example of how this inspirational blend of science and nature represents another significant evolution in the ongoing mission to conceive and manufacture the perfect aircraft. The A350 XWB has learned from nature to help ensure a healthy future for the planet, whether it’s the revolutionary adaptive wing design – inspired by birds – which morphs while airborne to achieve maximum aerodynamic efficiency by optimising wing loading, reducing drag and lowering fuel burn; or the savings generated by innovative technological advances. Designed with passengers and airlines at heart, the A350 XWB benefits from being built with over 70% advanced materials; combining carbon composites (53%), titanium and modern aluminium alloys, to create a lighter and more cost-efficient aircraft while also reducing maintenance requirements. The latest-generation Rolls-Royce Trent XWB engines are quieter and more efficient. The combination of these advantages result in 25% lower operating costs, fuel burn and CO2 emissions when compared with previous-generation aircraft – showing Airbus’ commitment to protecting the environment while remaining at the cutting edge of air travel.

The Airbus A220-100 is the newest aircraft added to the Delta fleet. The airliner was designed by Bombardier Aerospace and originally marketed as the Bombardier CSeries. Bombardier sold the CSeries airliner program to Airbus and it is now marketed by Airbus Canada Limited Partnership, a joint venture between Airbus and the Quebec government's investment arm Investissement Québec. It features the largest windows available on any modern airliner.

The Airbus A380 is a wide-body aircraft manufactured by Airbus. It is the world's largest passenger airliner. Airbus studies started in 1988 and the project was announced in 1990 to challenge the dominance of the Boeing 747 in the long haul market. The A3XX project was presented in 1994; Airbus launched the €9.5 billion ($10.7 billion) A380 program on 19 December 2000. The first prototype was unveiled in Toulouse on 18 January 2005, with its first flight on 27 April 2005. It was first delivered to Singapore Airlines on 15 October 2007 and entered service on 25 October.

The Airbus A340 is a long-range, wide-body commercial passenger jet airliner that was developed and produced by the European aerospace company Airbus. In the mid-1970s, Airbus conceived several derivatives of the A300, its first airliner, and developed the A340 quad jet in parallel with the A330 twin jet. In June 1987, Airbus launched both designs with their first orders and the A340-300 took its maiden flight on 25 October 1991. It was certified along with the A340-200 on 22 December 1992 and both versions entered service in March 1993 with launch customers Lufthansa and Air France. The larger A340-500/600 were launched on 8 December 1997, the A340-600 flew for the first time on 23 April 2001 and entered service on 1 August 2002.

The Boeing 717 is a twin-engine, single-aisle jet airliner, developed for the 100-seat market. The airliner was designed and originally marketed by McDonnell Douglas as the MD-95, a derivative of the DC-9 family. Capable of seating up to 134 passengers, the 717 has a design range of 2,060 nautical miles (3,820 km). It is powered by two Rolls-Royce BR715 turbofan engines mounted at the rear of the fuselage. The first order was placed in October 1995 by ValuJet Airlines (later AirTran Airways); McDonnell Douglas and Boeing merged in 1997 prior to production. The airliner entered service in 1999 as the Boeing 717. Production ceased in May 2006 after 156 were built. There were 148 Boeing 717 aircraft in service as of July 2018.

In November 1993, Southwest Airlines launched the Next-Generation program with an order for 63 737-700s and took delivery of the first one in December 1997. It replaced the 737-300, typically seating 126 passengers in two classes to 149 in all-economy configuration, similar to the Airbus A319. In long-range cruise, it burns 4,440 lb (2,010 kg) per hour at Mach 0.785 (450 kn; 834 km/h) and FL410, increasing to 4,620–4,752 lb (2,096–2,155 kg) at Mach 0.80–Mach 0.82 (459–470 kn; 850–871 km/h). As of July 2018, all -700 series on order, 1,128 -700, 120 -700 BBJ, 20 -700C, and 14 -700W aircraft have been delivered. By June 2018, around one thousand were in service: half of them with Southwest Airlines, followed by Westjet with 56 and United Airlines with 39. The value of a new -700 stayed around $35 million from 2008 to 2018, a 2003 aircraft was valued for $15.5 million in 2016 and $12 million in 2018 and will be scrapped for $6 million by 2023. The 737-700C is a convertible version where the seats can be removed to carry cargo instead. There is a large door on the left side of the aircraft. The United States Navy was the launch customer for the 737-700C under the military designation C-40 Clipper.

The Boeing 737-800 is a stretched version of the 737-700. It replaced the 737-400. The Boeing 737-800 competes primarily with the Airbus A320. The 737-800 seats 162 passengers in a two-class layout or 189 passengers in a one-class layout. The 737−800 was launched on September 5, 1994.

The 737-900ER (ER for extended range), which was called the 737-900X before launch, is the newest addition and the largest variant of the Boeing 737 NG line and was introduced to meet the range and passenger capacity of the discontinued 757-200 and to directly compete with the Airbus A321. An additional pair of exit doors and a flat rear pressure bulkhead increased seating capacity to 180 passengers in a two-class configuration.

The Boeing 757 is an American narrow-body airliner that was designed and built by Boeing Commercial Airplanes. The then-named 7N7, a twinjet successor for the 727, received its first orders in August 1978. The prototype completed its maiden flight on February 19, 1982 and it was FAA certified on December 21, 1982.

The Boeing 757-300 is a stretched version of the 757-200 model. It shares the narrow-body twin-engine design of the original, with the fuselage stretched before and after the wings.

The 767-300ER, the extended-range version of the 767-300, entered service with American Airlines in 1988. The type's increased range was made possible by greater fuel tankage and a higher MTOW of 407,000 lb (185,000 kg). Design improvements allowed the available MTOW to increase to 412,000 lb (187,000 kg) by 1993. Power is provided by Pratt & Whitney PW4000, General Electric CF6, or Rolls-Royce RB211 engines. The 767-300ER comes in three exit configurations: the baseline configuration has four main cabin doors and four over-wing window exits, the second configuration has six main cabin doors and two over-wing window exits; and the third configuration has six main cabin doors, as well as two smaller doors that are located behind the wings. Typical routes for the type include Los Angeles to Frankfurt. The combination of increased capacity and range offered by the 767-300ER has been particularly attractive to both new and existing 767 operators. It is the most successful version of the aircraft, with more orders placed than all other variants combined. As of November 2017, 767-300ER deliveries stand at 583 with no unfilled orders. There were 376 examples in service as of July 2018. The type's main competitor is the Airbus A330-200. At its 1990s peak, a new 767-300ER was valued at $85 million, dipping to around $12 million in 2018 for a 1996 build.

The Boeing 767-400 Extended Range (ER) airplane is the latest derivative in the 767 family, and is the first new airplane designed together by Boeing Commercial Airplane Group and Douglas Products Division (DPD). It is intended to replace the venerable Airbus A300/A310, DC-10, and L-1011 airplanes currently in service around the world. The 767-400ER delivers improved operating economics compared to these airplanes while offering similar seating capacity and range. It also provides operators of existing 767-200/-300 airplanes with the ability to increase passenger capacity and improve operating economics. The rollout of the 767-400ER is scheduled for August 1999, followed by first flight in September. First delivery is planned for May 2000. Design of the 767-400ER, a derivative of the 767-300ER, began in January 1997 through a technical assistance agreement between Boeing and the former Douglas Aircraft Company. Since the August 1997 merger of Boeing and McDonnell Douglas, the two divisions of the new Boeing Company have reached final configuration for the new airplane. Scheduled for delivery to launch customer Delta Air Lines in May 2000, this stretched version of the 767-300ER includes several improvements to meet customer requirements for increased passenger capacity and improved operating economics.

The Boeing 787 Dreamliner is a wide-body airliner manufactured by Boeing Commercial Airplanes. After dropping its Sonic Cruiser project, Boeing announced the conventional 7E7 on January 29, 2003, focused on efficiency. The program was launched on April 26, 2004, with an order for 50 from All Nippon Airways (ANA), targeting a 2008 introduction. On July 8, 2007, the prototype was rolled-out without major systems, and experienced multiple delays until its maiden flight on December 15, 2009. Type certification was received in August 2011 and the first 787-8 was delivered in September 2011 before entering commercial service on October 26, 2011, with ANA.

The 777-200LR became the world's longest-range commercial airliner when it entered service in 2006. It has a maximum range of 9,395 nm and was intended for ultra-long-haul routes such as New York to Singapore, or Chicago to Sydney - up to about 19 hours flying time. The -200LR features an increased MTOW and the same wing as the 777-300ER. The 777F is a cargo version of this variant. Three optional auxiliary fuel tanks take the baseline fuel tank capacity from 181,289 l to 203,570 l. Other new features include raked wingtips, redesigned main landing gear, and additional structural strengthening. As with the -300ER, the -200LR is equipped with wingtip extensions of 3.90 m. B77L is member of the B777 family of aircraft.

Delta retired its 747 fleet for the second and final time in 2017, replacing the 747-400 with more compact and efficient, twin-engine aircraft, such as the Airbus 350. The drawdown began on September 30, 2014, when three of the 16 Boeing 747-400s inherited from Northwest Airlines retired. The first Boeing 747-400 ever built—Ship 6301—retired from service on September 9, 2015, after logging more than 61 million miles. You can now tour it as the 747 Experience at the Delta Flight Museum.

The 777-300ER ("ER" for Extended Range) is the B-market version of the -300. Its higher MTOW and increased fuel capacity permits a maximum range of 7,370 nautical miles (13,650 km) with 396 passengers in a two-class seating arrangement. The 777-300ER features raked and extended wingtips, a strengthened fuselage and wings and a modified main landing gear. Its wings have an aspect ratio of 9.0.[191] It is powered by the GE90-115B turbofan, the world's most powerful jet engine with a maximum thrust of 115,300 lbf (513 kN).

The Bombardier CRJ100 and CRJ200 (formerly known as the Canadair CRJ100 and CRJ200) is a family of regional airliners that was designed and manufactured by Bombardier Aerospace between 1991 and 2006. The CRJ was Canada's second civil jet airliner after the single prototype of the Avro Canada C102 Jetliner (which never entered commercial service). It was based on the Bombardier Challenger 600 series business jets. An initial effort to produce an enlarged 36-seat version of the aircraft, known as the Challenger 610E, was terminated during 1981. Shortly after Canadair's privatisation and sale to Bombardier, work on a stretched derivative was reinvigorated; during early 1989, the Canadair Regional Jet program was formally launched. On 10 May 1991, the first of three CRJ100 prototypes conducted its maiden flight. The type first entered service during the following year with its launch customer, German airline Lufthansa.

The CRJ700, which seats up to 78 passengers, has the lowest trip cost of any in-production regional jet. It delivers outstanding performance and is the ideal platform for opening up new routes.

The CRJ900, when configured in a 76-seat dual- or triple-class configuration, offers extra legroom and superior comfort, making it the ideal regional jet seating layout in North America today. In a single-class configuration, the CRJ900 has the flexibility to easily seat up to 90 passengers. This capacity, combined with enhancements that result in 5.5% lower fuel burn, means the CRJ900 delivers the best economics in its class.

The E170 is the smallest aircraft in the E-Jet family and was the first to enter revenue service in March 2004. As of 2017, the E170 is largely out of production. The E170 typically seats around 72 passengers in a typical single class configuration, 66 in a dual class configuration, and up to 78 in a high density configuration. The E170 directly competes with the Bombardier CRJ700 and loosely with the turboprop Bombardier Q400.

The E175 is a slightly stretched version of the E170 and first entered revenue service in July 2005. The E175 typically seats around 78 passengers in a typical single class configuration, 76 in a dual-class configuration, and up to 88 in a high-density configuration. Like the E170, It is powered with General Electric CF34-8E engines of 14,200 pounds (62.28 kN) of thrust each. It competes with the Bombardier CRJ900 in the market segment previously occupied by the earlier BAe 146 and Fokker 70.

The McDonnell Douglas MD-80 is a series of single-aisle airliners developed by McDonnell Douglas from the earlier DC-9. Stretched, heavier, and with higher bypass Pratt & Whitney JT8D-200 engines, the DC-9 Series 80 was launched in October 1977. It made its first flight on October 18, 1979 and was certified on August 25, 1980. It was first delivered to launch customer Swissair on September 13, 1980, which introduced it into commercial service on October 10, 1980.

The McDonnell Douglas MD-90 is a single-aisle airliner developed by McDonnell Douglas from the MD-80, itself derived from the DC-9. After the more fuel-efficient IAE V2500 high-bypass turbofan was selected, Delta Air Lines became the launch customer on November 14, 1989. It first flew on February 22, 1993 and the first MD-90 was delivered to Delta in February 1995.