The 2016 Delta Air Lines Boeing 767-400 ER Aircraft Pilot Trading Card #51 is a collectible trading card featuring a pilot associated with the Delta airline. This card is part of a series of trading pilot cards that provide a unique and personalized touch to aviation enthusiasts and collectors. The card likely includes details about the specific pilot, as well as information about the aircraft and the airline itself, making it a valuable addition to any aviation memorabilia collection.