Airline travellers face disruption over the next two days as major strikes are expected across European air traffic control services.
British Airways, Ryanair and Easyjet have already announced cancellations on a number of scheduled flights.
Carriers have advised travellers to keep checking websites and social media for status of their flights, with Easyjet adding that delays are possible on other routes due to the knock-on effect of the strikes.
National Air Traffic Services said the industrial action is being taken to protest against the European Commission's "Single European Sky" initiative, which aims to consolidate air traffic services across the continent.
British Airways has cancelled eight flights on Wednesday between London and Milan, and six between London and Rome.
The airline said in a statement: "We have been forced to make some cancellations and have re-timed a number of flights to avoid the strike period."
Ryanair said the strike in Italy will mean the cancellation of 80 flights, but just four of these will be to or from the UK.
Easyjet has cancelled some flights to Paris to pre-empt a strike by French Air Traffic Control services.
Its website states: "Easyjet and all other airlines operating to and from Paris airports have been requested to reduce their flying programmes by 20 per cent."
ryanair.com, easyjet.com, britishairways.com
Tom Newcombe
