two days ago, I booked a round trip flight on expedia. Because of the web error I clicked the confirmation button twice. So I booked a duplicate flight but I don't know at that time. Today I check my credit card account, I found I was charged twice. I called Spirit, but they said they can cancel one of them but I can't get any refund. I think this doesn't make sense. How can one person use two same flight tickets at the same time, same day, same airline?