Too bad we didn't know about this at the time! The lucky people who snapped up cheap fares on United Airlines yesterday will be flying high. For 2 hours on 9/12 United Airlines accidentally offered fares for $0 on their website. The error occurred when incorrect data was entered into its computer system, and travelers were able to scoop up $5 and $10 tickets. The $0 cost tickets had only a security fee applied, but no taxes, as if they were award tickets like those associated with frequent flyer mileage redemption. Travelers were concerned that the tickets would be cancelled, but today airline officials announced that all the tickets would be honored. There was no information released on how many of these tickets were issued or the total cost to the airline.