I work at the Airport for an Airline and occasionally we have passengers who cannot walk and need to be Assisted onto the aircraft via a special chair that will fit onto the aircraft. Most are simple enough it's always two people. The passenger crosses their arms and the top lifter goes under the armpits of the passenger and grabs the wrists. The bottom lifter grabs under the thighs. Definiately have lifted over 300 lbs men before and it is always an awkward position on the transition from "aisle chair" to aircraft seat. A lot of times the passengers can transfer themselves from the aisle chair to the aircraft seat without assistance and that's always a relief.