RELATED: Scheduling mix-up could affect American flights over holidays
On Wednesday, the Union representing American Airlines said the airline had informed them of a problem with the pilot vacation system that caused the scheduling snafu.
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According to a post on the Union's website, "On Friday, management disclosed a failure within the pilot schedule bidding system. As a result, thousands of flights currently do not have pilots assigned to fly them during the upcoming critical holiday period.
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American Airlines has been responding to tweets from many people concerned with their upcoming flights, and is trying to assure fliers they "expect to avoid any cancellations."