I think I just got free airplane tickets and I'm not sure if I should point it out to the airline.
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On Monday I bought two round-trip tickets to two destinations in central Europe, for a total cost of about $450. They charged my debit card for the amount right after I bought the tickets, but the charge had vanished the next day and the money was still in my account.
Today I got paper tickets, with a receipt attached, for one of those trips, and I have an e-ticket and receipt in my inbox for the other trip. I've checked and both tickets are still marked "confirmed" in their booking system.
Since I have no ethical objections to taking advantage of a large corporation's mistake in my favour, I'm disinclined to point it out to them. But if they realize that they didn't get paid, through no fault of mine, will they cancel the tickets? Or just charge me for real? Could this be a bank mistake? What should I do?