Striking French air traffic controllers disrupted flights again on the third day of action that looks set to extend into the weekend.
At Orly airport south of Paris, 50% of flights were cancelled, while 15% were scrapped at Charles de Gaulle airport north of the city.
The controllers are upset at a restructuring plan that would jeopardise their status as public servants.
Following a meeting on Wednesday with the French transport minister, the controllers decided to pursue their strike. The walkout is currently scheduled to end at 8am on Saturday.
The talks themselves had gone well, but the written agreement to end the strike did not satisfy the strikers," said a union spokesman.
Press Association has contributed to the report.
Su-35 and Su-30 fighters were carrying out a scheduled training flight, when the incident occurred