Today’s strike by French air traffic control workers, which has led to mass disruption and flight cancellations, is set to be repeated over three more days later this month.

The SNCTA union says its workers will walk out on Wednesday 28, Thursday 29 and Friday 30 September in the continuing row over pay and working conditions.

Today’s strike, which began at 6am this morning and runs until 6am tomorrow morning (Saturday 17 September, has caused more than 1,000 cancellations and could disrupt many more flights passing over French airspace.

France’s aviation authority DGAC warned ahead of the walkout: “Flight cancellations and significant delays are expected.”

British Airways has cancelled 22 flights to and from Heathrow and warned there could be extra delays today.

EasyJet has cancelled 76 flights and issued a statement saying: “Like all airlines operating to/from French airports easyJet expects some disruptions to its flying program and has been requested by the French CAA to proceed to cancellations.

“While this is outside of our control, we would like to apologise to our customers for any inconvenience they may experience.”

Ryanair could not confirm how many flights in and out of the UK were affected, but said in total it has cancelled 420 flights, affecting 80,000 passengers.

The airline’s Operations Director Neal McMahon said: “”It is inexcusable that passengers who are not even flying to or from France are disrupted.”

Air France has cancelled 55% of its short and medium-haul flights and 10% of its long-haul flights for today.