Air France is marking 40 years of flights between Paris and Washington, D.C. with a special offer for passengers who fly between the two capital cities.

Travel between Washington and Paris until Dec. 15 and receive 4,040 additional Frequence Plus miles per transatlantic segment. This offer is valid for U.S.-resident Frequence Plus members only. Non-members can enroll by visiting http://www.airfrance.com/us.