Does last minute/walk-on flights work?

LS20

Banned
Jan 22, 2002
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way back when, i got a tip that if you are in no particular rush, you can wait around and board a plane late for really really cheap because they usually dont fill up

Has anyone ever done it? what kind of fares did you guess... everytime--and its been many-a-times--i flew on AA the plane was 75% capacity at MOST


I suppose its not possible now (since you need a ticket to get to the terminals) .. or is it?