In comparison to Mile High Club, this is just the same except doing it solo. In other words, masturbating on a plane.

Also known as Half Mile High Club

The self gratification equivalent of the Mile High Club

Having intercourse while on an aeroplane. To qualify, it must be moving.

A club containing individuals who have made 5,280 posts in an online forum.

The act of going from seat to seat on an airplane with the sole purpose of sexual intercourse with a fellow passenger. Drinks of an alcoholic nature are required, protection optional.

Join the mile high club. To have sex on a plane. Generally once it's up in the air (hence the mile high) Also included in Nickelback Rockstar lyrics:
gonna join the mile high club at 37 000 feet.

A secret organization of rich men who own private jets, and throw lavish parties while the fly around the world.