Planned airport strikes in France have forced airlines to cancel flights from Belfast.
Three days of strike action will begin in France on Tuesday - and spread throughout Europe on Wednesday.
France's main airports have asked airlines to halve their number of flights as air traffic controllers strike in protest at plans to centralise control of Europe's airspace.
Both Paris airports - Charles de Gaulle and Orly - warned of massive travel disruptions this week.
The strikes coincide with a speech in Strasbourg by the EU's commissioner for transportation, who is asking to speed up the plan as inefficiencies in Europe's airspace costs airlines and customers €5 billion annually.