How about a compromise?! Four airports, as before... you have to get two cards offsite, but can get up to 4. We play a variation on "texas holdem" with three community cards that everyone plays off of, and you take the best hand you can get with your 2, 3, or 4 cards. No purchase of an extra $5 card at the table, no "Gastons" card--you get your cards (2, 3, or 4--how adventurous do YOU want to be?) at the outlying fields.
Everyone plays the same 3 "Gastons" cards: 1 "gear up (flop)", 1 "procedure turn", 1 "white river" card
You play your two cards for best hand of 5, or two of your three cards for the best hand of five (discard one from your hand), or two of your four cards for the best hand of five (discard two from your hand).