A dispute between aviation workers and management at the French capital's airports threatens to overshadow years of preparations and a €50-million investment for visitors and athletes arriving for the Paris Olympics this month.

Unions at state-controlled ADP group, which runs the main Charles de Gaulle Airport and its crosstown rival Orly, announced a one-day stoppage on July 17 to press for bigger Olympics bonuses and staff recruitment.

If it continues, the standoff with management could impact the Games, with athletes set to start arriving en masse from July 18 and hundreds of thousands of ticket holders flying in ahead of the July 26 opening ceremony.