Passengers were facing delays at Charles de Gaulle Airport in Paris and cancellations at Lyon’s airport Monday as a strike by security workers during the busy holiday season entered a fourth day. A spokeswoman for Aeroports de Paris, which runs the capital’s airports, said passengers should expect delays at security checkpoints at Charles de Gaulle but that the city’s other main airport, Orly, was operating normally. The Lyon-Saint Exupery airport, France’s fourth busiest, was most badly hit by the strike, with 30 percent of flights cancelled. Other flights were facing delays and the airport warned that large baggage such as skis and golf bags would not be allowed through security checkpoints.