Air travelers in Europe faced more disruptions Monday after a winter storm snarled flights at several hub airports this weekend. 

The wintry weather brought cancellations and delays on Sunday to major airports across western Europe, including busy hubs in Germany, Switzerland, Belgium the Netherlands and the United Kingdom.

In England, the Birmingham, London Stansted and London Luton airports briefly suspended flights as runways were cleared. London’s Heathrow Airport – Europe’s busiest – also was hard it Sunday and warned of continuing disruptions Monday. (ListThe world’s 20 busiest airports, 2016)

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“Some flights at Heathrow will be disrupted today due to crew and aircraft being out of position following yesterday’s weather,” Heathrow Airport warned via Twitter. “As always, our advice to passengers is to check your flight status with your airline before coming to the airport.”

The Independent of London said de-icing queues for aircraft was one of the main causes for the flight backups. The newspaper estimated more than 50,000 travelers had their plans upended by the weather.

Upwards of 330 flights were canceled at Heathrow on Sunday and another 575 were late, according to flight-tracking service FlightAware