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1.
The name of a person who misses their flight because they drinking heavily in the airport bar.

Alternate meaning: Anyone acting like an ass on an airplane.
Dude, I'm such a flightnard! I got wasted in airport pub at Heathrow and missed my flight to Hamburg.

Alternate usage: I heard the stewardesses making fun of a flightnard in first class that kept farting on the plane to Amsterdam.
by Crab&Cabbage February 03, 2011