American Airlines has created a Christmas disaster for itself.
A computer programme authorised so many of its pilots to take holidays that thousands of flights may have to be cancelled.
The airline is blaming a software glitch and the Allied Pilots Association says 15,000 flights in the second half of December currently have no pilots to fly them.
The company is now offering overtime rates to pilots willing to work, but the union doesn't like their solution and has filed a grievance.
It says American Airlines' solution violates their pilots' contract, because of how overtime pay was restricted.