Ryanair has canceled more than 250 flights to France due to a planned strike by French air traffic controllers.
Further cancellations are likely, the low-cost airline warned.
The SNCTA union of air traffic controllers told the French Civil Aviation Authority (DGCA) that the strike would take place on April 8 and 9.
“Disruption is expected over the whole country,” the DGCA said.
The Authority has asked airlines to cut their schedules for flights to and from France on April 8 by 40%.
The SNCTA says it is unhappy about offers made by the state on new working conditions and retirement plans.
The union has also called on its members to go on strike between April 16-18 and April 29- May 2.
“We sincerely apologize to all customers affected by this unwarranted strike action and we call on the EU and French authorities to take measures to prevent any further disruption,” said Ryanair in a statement.
“It’s grossly unfair that thousands of European travelers will once again have their travel plans disrupted by the selfish actions of a tiny number of French ATC [air traffic control] workers.”
Ryanair is offering to transfer customers’ tickets to other flights or provide refunds.
Air France says that it expects to operate almost all its long-haul flights and 60% of its medium-haul flights to and from Paris Charles de Gaulle airport.
Travelers booked on short- and medium-haul Air France flights on April 8 or April 9 can choose to travel between April 10 and April 15 instead, it said.
“Expect cancellations and major delays,” warned the European Organization for the Safety of Air Navigation on Twitter.
The fire in Aurora air traffic control facility that grounded all flights in and out of Chicago’s two major airports was set by an employee, officials say.
Brian Howard, 36, has been charged with one count of destruction of aircraft or aircraft facilities in connection with the fire in the building’s basement.
The man was found with burns and self-inflicted wounds. Investigators say Brian Howard used petrol to light the blaze.
By Friday afternoon flights in and out of O’Hare and Midway airports were slowly resuming.
More than 850 flights were cancelled in Chicago alone and many already in the air were redirected.
In a statement, the FBI said Brian Howard was charged on September but remained in hospital recovering from his injuries. No court date has been scheduled.
“We believe he set the fire and he used some kind of accelerant,” Aurora Police Chief Greg Thomas said in a news conference on September 26.
The fire in Aurora air traffic control facility grounded all flights in and out of Chicago’s two major airports
The building was damaged by the fire and the water used to extinguish the blaze.
Officials said they did not yet have a possible motive for the act but said Brian Howard was a contractor for the Federal Aviation Administration (FAA) and was authorized to be in the building. He had no ties to terrorism.
The fire broke out just before 06:00 local time on Friday morning in the Aurora, Illinois, air traffic control building, 40 miles west of Chicago.
Air traffic control officials said the radio frequencies with which they worked went dead and the control system was immediately shifted to a back-up system, the Chicago Tribune reported.
Workers used the back-up system until they were forced to evacuate.
“The [radio] frequency failed,” an unnamed controller told the newspaper.
“Depending on how bad the fire was, it could be a real mess getting things back to normal.”
One man was treated for smoke inhalation at the scene but no-one else was injured.
FAA spokeswoman Elizabeth Cory said management of the region’s airspace was transferred to another facility as the Aurora centre was evacuated.
By Friday afternoon, flights already on their way to Chicago were allowed to continue but landed at a slower pace.
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