# Tens of thousands of passengers remain stranded at UK airports today, following a technical fault at the National Air Traffic Services. The issue caused some one-thousand-300 cancellations of flights to or from airports in the UK yesterday. According to FlightRadar, the worst affected airports were Heathrow, Gatwick, Manchester and Birmingham. More than 250 flights have been cancelled today. NATS has ruled out a cyber-attack as the cause of the major outage. Even if the issue is resolved, the disruption is likely to persist due to backlogs.
Tens of thousands of passengers stranded at UK airports following an air traffic control issue