Hmm maybe I should run to the store and buy one of those prepaid Visa cards (anyone know the max you can put on these?) and just buy online before I head to the airport. I'm looking at a 4:00 PM out of JFK. Anyone have experience using a Visa gift card to book a flight at DL.com? This would also help me avoid the possibility of the fare suddenly jumping up or DL somehow running out of inventory on my way to JFK. Too bad the Manhattan ticket office is closed on Saturdays...