United Airlines resumes U.S. flights after computer problem grounded planes

United Airlines said Monday that six flights were canceled and 200 more were delayed because of a computer problem that forced a 2 1/2-hour ground stop for all domestic flights Sunday.

Company spokeswoman Maddie King calls the glitch an “IT issue.”

The airline said it would waive flight-change fees through Wednesday for any travelers affected by the problem. United says there will be no extra charge for anyone flying in the same class and between the same cities.

Chicago-based United Airlines and United Express operate more than 4,500 flights a day to 339 airports across five continents.

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UPDATES:

Jan. 23, 3:38 a.m.: This article was updated with United’s estimate of the number of flights affected.

9:05 p.m.: This article was updated with United reporting that the ground stop had been lifted.

This article was originally published on Jan. 22 at 5:55 p.m.