UK air passengers are facing major disruption due to a strike by Italian air traffic controllers, with scores of flights cancelled.
The four-hour stoppage tomorrow has led to Ryanair axing 96 flights to and from Italy, including four return services involving flights to and from the UK.
EasyJet has had to cancel up to 60 flights and other UK carriers are also likely to be affected by the action, which lasts from 11.30am to 3.30pm UK time.
The Ryanair cancellations include Manchester-Bologna, Stansted-Ancona, Stansted-Trieste and Liverpool-Pisa.
Ryanair warned that further delays and cancellations are likely and advised passengers to check the status of their flight.
An easyJet plane carrying 157 passengers has had to make an emergency landing after smoke was detected in the cockpit.
The Airbus A320 aircraft, en route from Liverpool to Naples, touched down safely at Gatwick airport around 7.20am today.
The plane, which had left Liverpool at 6.40am, is being checked.
An easyJet spokesman said:
British Airways and EasyJet are among airlines to cancel flights on Tuesday as French public service workers go on strike.
Affected BA flights are: BA304/307, BA324/329, BA332/333, BA2622/2623, BA348/349, BA486/487.
EasyJet customers can see which flights are affected here.
Ryanair has confirmed a number of flight cancellations and has predicted significant delays and further cancellations for the rest of the day.
The list of cancellations, posted on its website, comes amid warnings to passengers that European flights in the next two days are likely to encounter delays and disruptions as Air Traffic Control staff are planning to strike in Italy and Portugal.
Passengers planning on flying to Europe in the next two days are likely to encounter delays and disruption to European flights as Air Traffic Control staff are planning to strike in Italy and Portugal.
Airlines are advising customers, particularly those on short-haul flights, to check their websites for the status of their flights, see below for details on where to check the status of your flight.
easyjet will advise all affected passengers on flights into and out of Lisbon and on flights to and from Milan Malpensa via email. Customers can also check their flights on the airline's Flight Tracker page.
British Airways have also re-timed a number of flights to avoid the strike period and have made some cancellations. The airline advised passengers to check its website for up-to-date information concerning flights departing in the next two days.
The European Air Traffic Control services strikes expected over the next two days in Portugal and Italy will have a significant impact on flights, according to easyJet.
The airline said it had pro-actively re-timed some flights later into and out of Lisbon in order to avoid the strike period as well as re-timing some flights to and from Milan Malpensa.
"Like all airlines flying to/ from/and over these countries, we expect it will have a significant impact on our flights during these periods.easyJet would like to reassure passengers that it will do everything possible to minimise any inconvenience for passengers," easyJet said in a statement.
British Airways (BA) have also retimed and cancelled a number of flights to and from Italy, a spokeswoman said.
"We are doing all we can to minimise disruption to customers affected by air traffic control strikes across Europe. We are advising customers on short-haul services to keep checking the very latest information on our website," said a spokesman for BA.
easyJet said the industrial action is likely to continue into Thursday with the French Air Traffic control staff taking part.
An easyJet spokesman has said that the airline has not seen any increase in passenger numbers from Bulgaria or Romania to the UK.
He said: "EasyJet currently only flies to two destinations in Bulgaria and Romania and other airlines provide far more frequent services.
"We haven't seen any evidence of an increase to our passenger numbers from January 2014 on these routes."
EasyJet says its customer service line will stay open until midnight, after many passengers have been left stranded at Gatwick Airport. A power outage at North Terminal has led to cancellations and delays.
The airline has been forced to cancel 38 flights in total today and a number have been delayed.
EasyJet advised passengers to check in for flights as normal "as the situation can improve", but suggested they refer to the airline's flight tracker page for updates.
A message on its website read: "Although this is beyond easyJet's control, we apologise for any inconvenience that you may experience today."
Budget airline easyJet has reported a 50.9 per cent rise in annual profits to £478 million.