United Airlines ground stop lifted, delays continue

United Airlines says all of its domestic flights are grounded on Sunday because of a computer problem.

Company spokeswoman Maddie King said in a brief statement that it issued a ground stop in the U.S. because of an "IT issue." It did not give any more details, and it was not immediately clear how many flights were affected.

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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