<P> As of 28 February 2018 , the Delta Air Lines mainline fleet comprises 855 aircraft in service , making it one of the largest airline fleets in the world . Before merging with Northwest Airlines in 2009 , Delta Air Lines operated an all - Boeing and McDonnell Douglas fleet ; it incorporated Northwest 's Airbus aircraft into its fleet following the merger and subsequently ordered further Airbus types . Delta is known for its policy of generally buying older generation or used aircraft and for continuing to fly aircraft for 20 - 30 years , much longer than most other major airlines . As such , it has one of the oldest fleets of any American airline , with an average fleet age of 17 years as of 2017 . Fellow U.S. legacy carriers American Airlines and United Airlines have younger fleets ; as of December 29 , 2016 , American had an average fleet age of 10.3 years , while United had an average fleet age of 14.1 years. . </P>
<P> As of 28 February 2018 , the Delta Air Lines mainline fleet comprises 855 aircraft in service , making it one of the largest airline fleets in the world . Before merging with Northwest Airlines in 2009 , Delta Air Lines operated an all - Boeing and McDonnell Douglas fleet ; it incorporated Northwest 's Airbus aircraft into its fleet following the merger and subsequently ordered further Airbus types . Delta is known for its policy of generally buying older generation or used aircraft and for continuing to fly aircraft for 20 - 30 years , much longer than most other major airlines . As such , it has one of the oldest fleets of any American airline , with an average fleet age of 17 years as of 2017 . Fellow U.S. legacy carriers American Airlines and United Airlines have younger fleets ; as of December 29 , 2016 , American had an average fleet age of 10.3 years , while United had an average fleet age of 14.1 years. . </P>
how many planes are in the delta fleet
how many planes are in the delta fleet
855
855