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A technical failure in the UK air traffic control system operated by NATS has caused widespread disruption.
More than 2,000 flights were canceled across two days.
Airports including Heathrow were severely affected.
International carriers including Air India and IndiGo were hit, leaving some passengers stranded.
Why it mattersThe disruption strands travellers and ripples across international routes, including flights from India.
More context
Ongoing disruption led to additional cancellations, long queues, diverted flights, and logistical problems as airlines tried to clear the backlog.
Airlines have demanded the resignation of the NATS chief executive.
The transport secretary has requested a full investigation into the incident.