More than 1,500 flights have been cancelled on July 3-4, affecting nearly 300,000 passengers, due to a strike by French air traffic controllers, European industry lobby Airlines for Europe said in a statement.

Expect disruption on multiple airlines including Ryanair and easyJet, and in countries including France, Spain and Greece

Airlines across Europe have canceled hundreds of flights on the second day of an air traffic controllers’ strike in France that’s causing chaos just as the busiest travel season of the year gets underway.