I was in high school in the '60s and a cheap date night activity was to go to Hobby and stand on the observation deck/roof and watch planes take off and land. The other fun thing was when they had a "walk-on" fare. You just got on the plane, took your seat, and the flight attendant came around to accept your payment. No reservations, just first-come, first-served.
We used to wonder what would happen if we just walked on, the plane took off, and they found we had no money? Remember, teenagers aren't that bright!
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