India, July 4 -- A large-scale strike by French air traffic controllers has thrown European summer travel into chaos, forcing the cancellation of nearly 40 percent of flights at major airports including Paris Charles de Gaulle, Orly, and Beauvais.

The industrial action, driven by demands for improved staffing and higher pay, also disrupted half of flights in Nice and 30% in Marseille, Lyon, and other key hubs, with widespread delays rippling across the continent.

Budget carrier Ryanair alone canceled over 400 flights, impacting 70,000 passengers. The airline urged the European Union to reform air traffic rules, citing the strike's sweeping impact on both flights over French airspace and those traveling to and from France.

The unions behi...