"As of February 1, 2018, Delta's fleet consists of 860 Airbus, Boeing, and McDonnell Douglas aircraft. Delta's 481 Boeing aircraft make up about 56% of its fleet, while its 202 Airbus aircraft makes about 24% and 166 McDonnell Douglas aircraft makes up about 20%. Delta's 703 narrow-body aircraft comprise about 83% of its fleet, while its 146 wide-body aircraft comprise the remaining 17%.
Delta operates the largest fleets of the Boeing 717, the Boeing 757, the Boeing 767, the McDonnell Douglas MD-80, and the McDonnell Douglas MD-90 worldwide. It is one of only two airlines worldwide operating the Boeing 767-400ER (the other being United Airlines), and the only airline still operating the MD-90 in the world.
Delta has one of the oldest fleets of any American airline, with an average fleet age of 17 years as of 2017. Its oldest aircraft types are the MD-88, MD-90, Boeing 757-200, Boeing 767-300, Boeing 767-300ER, and Airbus A320-200, which have an average age of 27.4, 20.9, 21.1, 24.5, 21.6, and 22.3 years, respectively. Its youngest aircraft types are the A321-200, A350-900 and Boeing 737-900ER, which have an average age of 1.5, 0.3 and 2.4 years, respectively.[2] While Delta is sometimes thought to always purchase older generation or used aircraft, this is not always the case, as evidenced by its order of 25 A350s and 25 A330neo aircraft in November 2014 and its order of 75 Bombardier CS100 aircraft in April 2016. In addition, Delta ordered 100 A321neo aircraft to replace its aging 757s and MD-90s. These new A321neo aircraft are expected to be delivered starting in 2020, and will continue deliveries through 2023.
Delta primarily uses its narrow-body aircraft for domestic flights within the United States and for international flights from the United States to Canada, Mexico, and the Caribbean. Most of its McDonnell Douglas MD-88 and Boeing 717 aircraft are based out of Atlanta, where they are mainly used for short-haul flights.[4] Its A320 aircraft, Boeing 737, and Boeing 757 aircraft are used for short-haul flights and medium-haul transcontinental flights. A few of its Boeing 757-200 aircraft are used on long and thin flights to Europe. Delta primarily uses its wide-body aircraft for long-haul flights to Europe, South America, and Asia, though some Boeing 767-300 (non-ER) aircraft operate domestic flights within the United States. Its A330s, Boeing 767-300ERs,[5] and Boeing 767-400ERs mainly operate flights to Europe. Its Airbus A350-900s and Boeing 777-200s mainly operate flights to Asia."
This is what I was thinking off when I said realistic...