United Trying to Make an Extra Buck With Cashless Cabins

United will sell you a prepaid debt card in the airport now.  The idea is to take a passenger's money two additional times because the card comes with a large purchase fee and then the passenger will promptly use it to pay for check in related fees or buy on board items.  Spirit Airlines is the best at ancillary revenue, but they haven't thought of this idea yet.

Airport Prepaid Card Vending Machine