People travelling from Gatwick and Luton airport face disruption today as French transport workers go on strike.
Easyjet has cancelled 118 flights, with Ryanair, British Airways and Flybe also affected.
Passengers are being advised to check with their airline.
Passengers on a plane from Israel to Britain had a shock when they realised there was a snake on board.
EasyJet said the animal was harmless and those on board were not in any danger but they called out authorities to meet the plane when it landed at Luton at 8pm yesterday.
A spokeswoman said:
"easyJet can confirm that a passenger brought a small, pet snake in a container on board a flight from Tel Aviv to Luton.
"As soon as crew became aware of this they dealt with the issue in a professional manner, immediately contacting the authorities to ensure they met the aircraft at Luton.
"The safety of passengers is always our highest priority. The harmless snake remained in its container at all times and passengers were not in any danger. We have raised the issue with the airport to understand why the reptile was not detected during security."
A technical issue on the easyJet website has meant travellers are unable to use the online check-in or booking facilities. There are reports of long queues at airports as all passengers are forced to manually check-in.
An Easyjet flight from Hamburg to Luton has been diverted to Stansted over a security alert, it has been reported.
The plane is on the ground, and the passengers remain on board. Essex Police are believed to be attending the incident.
Luton based airline easyJet is to create 330 new jobs for pilots this year across its 11 UK bases, which include Southend, Luton and Stansted.
The company says it offers a clear career path for pilots with the potential to move from first officer to captain more quickly than other airlines.