An Air France flight from Paris to Detroit was diverted to Montreal's Trudeau International Airport on Wednesday after a passenger from the Democratic Republic of Congo boarded the aircraft in error. U.S. authorities notified Canadian officials, leading to a quarantine assessment that found the traveler asymptomatic; the passenger returned to Paris while the flight continued to Detroit. The incident occurred amid U.S. entry restrictions requiring travelers from the DRC and neighboring countries to route through Washington Dulles for enhanced screening.