Air France flight crews are on strike until Wednesday protesting the proposed reduction of crew members per flight.

Air France management cancelled many flights Sunday, and expects to cancel about 15 percent of scheduled flights Monday. Air France has been relying on other airlines to lessen the strike’s impact.

The strike coincides with a busy holiday weekend in France.

Air France encourages travellers to monitor its website and check flight status before heading to the airport.

The strike has forced the cancellation of several flights between Paris and New York, Washington and Abu Dhabi, as well as several other cities.