American Airlines, the world's largest airline by fleet size, took delivery of its first Boeing 787-8 Dreamliner on January 23, 2015. Before using its new Boeing widebodies on their intended international routes, American Airlines said it would use the new aircraft on domestic routes to help acclimatize cabin crew. American Airlines first Boeing 787-8 flight took place on May 7, 2015, when it flew between Dallas Fort Worth International Airport (DFW) and Chicago O'Hare International Airport (ORD).