I think last minute travelers are sometimes taken advantage of. It would be innovative to create an airline or program that allowed passengers to purchase flight / air time in advance each year to be used if booked 21 days in advance OR 21 minutes in advance to departure (assuming a spot was avaialable on the plane). To charge the same passenger triple or more due to unforseen circumstances can be harsh. The prepaid flight time can expire at the end of each year (as designated by airline to end during off peak time instead of end of calendar year to keep everyone from flying at high peak times).
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