Fixed a technical problem that sparked delays: UK air traffic control

Thousands of airline passengers faced delays on Monday after Britain’s air traffic control system was hit by a breakdown that slowed takeoffs and landings across the U.K. on one of the busiest travel days of the year.

More than three hours after it reported the technical issue, flight control operator National Air Traffic Services said it had identified and remedied the problem and flights could begin to return to normal. But scores of flights were canceled, and Heathrow Airport said its schedules would be significantly disrupted for the rest of the day.