International air travel could come booming back next year but with a new rule: Travelers to certain countries must be vaccinated against the coronavirus before they can fly. Encouraging news about vaccine development has given airlines and nations hope they may soon be able to revive suspended flight routes and dust off lucrative tourism plans. But countries in Asia and the Pacific, in particular, are determined not to let their hard-won gains against the virus evaporate. In Australia, the boss of Qantas, the country’s largest airline, said that once a virus vaccine becomes widely available, his carrier will likely require passengers use it before they can travel abroad or land in Australia. Qantas Chief Executive Alan Joyce said he’s been talking to his counterparts at other airlines around the world about the possibility of a “vaccination passport” for international travelers. “We are looking at […]