Dallas, Texas (WFAA) - A glitch within a schedule system has left thousands of American Airlines flights without pilots assigned to them during the holiday time, read a post titled "Holiday Scheduling Failure" on the Allied Pilots Association site.

"Today, management issued an update detailing the 'significant holes' in the operation and unilaterally invoked a solution for crewing affected flights," read the post that went live at 6:29 p.m. Tuesday. "Management’s actions are in direct violation of your contract."

In reaction, the APA, which represents about 15,000 American Airlines pilots, has filed a Presidential Grievance, according to the post.

"Because management unilaterally created their solution in violation of the contract, neither APA nor the contract can guarantee the promised payment of the premium being offered," wrote the union.

On their Twitter feed, American Airlines responded to several inquiries about the news by saying the airline had no plans to cancel flights.