United Airlines said on Friday that it will honor the tickets it accidentally gave away for free.
The decision is good news for people who snapped up the tickets on Thursday after United listed airfares at $0. Many customers got tickets for $5 or $10, paying only the cost of the Sept. 11 security fee.
The mistake was an especially good deal for any passengers who bought tickets for travel within the next week. For instance, a Houston-to-Washington Dulles flight for next weekend would have cost $877, according to United's website on Friday.
Airlines have posted so-called mistake fares before. They generally decide on a case-by-case basis whether they'll honor the ticket. On Friday, United Continental Holdings Inc. said it was honoring the tickets "based on these specific circumstances." On Thursday, United said there was an error in filing the fares to its computer system.