If you’re planning a vacation that involves Air France, well, you should probably keep a close eye on your itinerary: the airline is warning travelers that a worker strike that’s already grounded 900 flights and affected 150,000 customers may result in more last-minute flight cancellations.

Air France cabin crew employees have been on strike for about a week now to protest against any more staff cuts, with plans to end it on Aug. 2.

On Monday, the airline said it would have to cancel about 5% of its long-distance flights, which is less than in previous days. About 20% of domestic and European flights in and out of Paris’ Charles-de-Gaulle airport have been canceled.

“Difficulties with crew compositions may also limit the number of passengers per flight,” Air France said.

There could be more cancellations and delays in sight, the airline warned, so it’s best to keep an eye on the website and check your flight status before you head to the airport. If you’ve given the airline your contact info, watch for an email or text warning of any issues.

Tomorrow, on the day the strike is slated to end, Air France says it expects to offer 100% of its long-haul flights, almost 90% of its domestic flights, and 85% of its medium-haul flights.

“Air France teams are doing all they can to minimize the impact of this strike action on customers and are at their disposal to inform and assist them,” the airline said.

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