Airlines are not allowed to charter flights between two countries if they are not based out of either. That’s why you won’t find Delta selling trips between Canada and France, or Malaysia Airlines flying between the U.S. and England. Except, as the Wall Street Journal notes, when a 1944 treaty allows it. “Some airlines are allowed to carry customers between two non-native countries, usually when a fuel stop is involved,” writes Scott McCartney, the Journal’s Middle Seat columnist. “It’s called the fifth freedom. Established with an international treaty in 1944, the nine aviation freedoms lay out what commercial airlines can and can’t do throughout the world…….