An air treaty between Japan and the US that was signed more than 50 years ago could be behind the Japanese government's reported preference for Japan Airlines (JAL) to switch alliances and join Delta Air Lines in Skyteam."The [Japanese] government is deeply concerned with the open sky policy between Japan and the US," said Hajime Tozaki, professor of transport at Tokyo-based Waseda University's organisation of Asian studies. "The [former] air transport treaty between the US and Japan has been unfair. The main issue for the government is to reduce the share of slots at Narita ...