About 1,400 US flights were cancelled early on Sunday after the north-eastern part of the country was walloped by a fierce winter storm a day earlier, with much quieter weather expected on Sunday.
Several US states had declared emergencies in response to the storm, which formed in the Atlantic Ocean off the Carolinas and was forecast to continue depositing snow into Sunday morning as it moved north to Maine.
The total number of flight cancellations within, into, or out of the US was about 1,400 as of 10.30am ET (1530 GMT), according to flight-tracking website FlightAware.com. Another 647 US-related flights were delayed, the data showed.