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18.
To have intercourse while piloting an aircraft. The altitude must 5,280 feet MSL not AGL. In other words, one cannot park on Denver Airport property, bang each other, and earn their wings to the Mile High Club.
I was inducted into the Mile High Club while flying a Cessna 172.
by Boombala November 25, 2006
 
1.
having sex in an in-flight airplane, technically while at least a mile above the ground
by Anonymous May 19, 2003
 
2.
Indulging in any form of sexual intercourse in an in-flight Airplane restroom, while, obviously, being at least a mile off the ground.
"I hope the flight attendant didn't see us come in here...she might know we're becoming members of the Mile High Club."
by Delusional Confusion January 15, 2005
 
3.
Preforming any sexual thing while being in an airplane during flight, usually in the bathroom.
When I go to Florida in the spring with Mike, we are going to become members of the "Mile High Club".
by SaM* September 20, 2005
 
4.
To have sex in an airplane bathroom, usually when a mile above the ground.

Takes place in almost every airplane to take flight.
Dammit, what's with this turbulence? The weather's perfectly calm right now!

(glances at airplane bathroom door)

Oh wait, never mind....

------------------------------------------------------------------------

The Mile High Club is perhaps the easiest club to get into, if you know what I mean.
by Hurricane Season June 13, 2009
 
5.
Men and women who have had sex while flying in an airplane.
Are you a member of the mile high club?

Not yet, but I'm dying to be in it.
by kyoung April 08, 2008
 
6.
Having sex with another person in an airplane.
I had consensual missionary sex with my wife in an airplane and we joined the mile-high club. Then I banged the stewardess and got a gold membership.
by Duke January 27, 2003
 
7.
Getting fucked in an airplane, during the flight.
Dude, today I became a member of the Mile High Club!

No way!!!

Yeah I boned one of the hot airline attendants!
by Your new best friend, round 2 January 26, 2011