Greek trade unions announced another series of strikes that are expected to cause further travel disruption.
Domestic flights will be hit by industrial action today and both international and domestic flights will be affected by strikes over the weekend and into next week.
The first wave will cause disruption from Saturday to Monday and this will be followed by a second strike from next Wednesday to Thursday.
The UK Foreign Office is advising travellers to Greece to contact their airline or tour operator if they intend to travel on these dates.
A general strike in Belgium is affecting flights today. British Airways has cancelled the majority of its flights to Brussels and EasyJet said it had also cancelled a number of services to and from the Belgian capital.
