Flights crossing France’s airspace, even those not destined for the country, faced delays and rerouting at the start of the summer vacation period.

Widespread disruption continued in airports across France on Friday, the second day of a strike by air traffic controllers demanding better working conditions.

Ryanair was among airlines that announced widespread disruptions, saying in a statement it canceled more than 400 flights affecting 70,000 passengers. The company said the strike affects all its flights over French airspace, as well as traffic in and out of French airports, and urged the European Union to reform air traffic rules.