Which flights, airports were affected?

LONDON: US flights were slowly beginning to resume departures and a ground stop was lifted after the Federal Aviation Administration (FAA) scrambled to fix a system outage overnight that forced a halt to all US departing flights.

Here's what we know so far:

Numbers of flights

– A total of 4,314 flights were delayed within, into or out of the United States as of 1411 GMT, flight tracking website FlightAware showed, without specifying the cause of the delays

– Another 758 flights within, into or out of the country were cancelled

– Some 21,464 flights are scheduled to depart airports in the United States on Wednesday with a carrying capacity of nearly 2.9 million passengers, data from Cirium shows

– American Airlines has the most departures from US airports with 4,819 flights scheduled, followed by Delta Air Lines and Southwest Airlines, the Cirium data showed

International

– The operator of Paris' international airports – Paris Charles de Gaulle and Orly – said it expects delays to flights.

– Virgin Atlantic said some US departures may be affected by the outage and asked customers due to travel on Wednesday to check their flight status.

– Air France, Lufthansa, British Airways and Iberia, which are both owned by IAG, continue to operate flights to and from the United States as normal for now.

– Iberia said it could operate with an alternative system, while the French airline said it was monitoring the situation.

– Scandinavian airline SAS said it is not affected. It has one flight due to land in the United States later on Wednesday.