The scenario you propose would do nothing to "screw the airline." Airlines overbook with the expectation that there will be a certain number of no-shows. Your seat purchased with the voucher would factor into that equation. If the flight didn't sell out then holding up the seat by using your voucher did nothing. If the flight did sell out they would un-check you in 15 minutes before departure and go to the oversale or standby list. Again your action only caused a minor inconvenience and probably just gave some poor passenger an anxiety attack about wether or not she was going to get on that flight! Either way the financial impact to the airline is zero.
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