Deboarding.
Disembarking would also be acceptable.
Disembarking.
the bush plane on the plane were take off
Deplaning or alighting
Angry is another word for ticked off.
He was on a tour and fainted while he was getting off the plane.
I finally got off the plane.
After take-off a plane climbs to a safe altitude before leveling off.
Get off the sofa! Take off your coat and stay awhile. The plane will take off in a minute.
Jet?
taxi, run up, rotate, flaps
Intermittent.
"I stepped onto the plane." "The plane took off into the air." "Is that your plane?" Etc. :)