Nearly 300 flights were canceled because of a technical issue in the U.K. air traffic control system, the flight monitoring website Flightradar24 reported. https://apnews.com/article/uk-airports-traffic-control-disruptions-408a8997d9fb39508e922e09d2523884?taid=6aa02f8dab199800014a72b2&utm_campaign=TrueAnthem&utm_medium=AP&utm_source=Twitter