Delta Air Lines and Air France have signed a joint venture agreement wherein the airlines will share revenue and costs on transatlantic routes. Specifically, Delta will begin serving London Heathrow using three of Air France’s slots (codeshare flights): between London and Los Angeles on Air France, two flights between London and New York (JFK) on Delta and between London and Atlanta on Delta; plus additional nonstop flights. A joint press release states one result of the agreement will be, “Increased travel options for passengers including more flights…and more frequent flyer upgrade and mileage redemption opportunities than ever before.” The first phase of implementation will begin April 2008 and is expected to provide a 45 percent increase in available seats.