In this Feb. 19, 2019, photo, a Bamboo Airways airplane taxis on the tarmac at Noi Bai airport in Hanoi, Vietnam. U.S. President <PERSON> and Vietnamese President <PERSON> have presided over a signing ceremony for several commercial trade deals in Hanoi, including agreements to sell 110 Boeing aircraft worth billions of dollars to the booming Southeast Asian country. (AP Photo)