deboard
/ˌdiːˈbɔːd/originally and chiefly US
verb
1 [with object] To get off (a train, aeroplane, etc.); to disembark from.
2 [no object] To get off a train, aeroplane, etc.; to disembark.
3 [with object] To remove from a train, aeroplane, etc.; to allow (passengers) to disembark.
Origin
1960s; earliest use found in The Washington Post. From de- + board.