Oneways Cuba -> Canada
Looking at Cuba travel options, I was surprised to see that Air Transat does not sell oneways from Cuba to Canada. They do sell them the other way round. They say that restriction is "for legal reasons". What legal reasons could that be that would disallow oneways in one direction only?
WestJet, Cubana and Air China don't seem to suffer from that restriction. They offer oneways from Cuba to Canada on their respective websites. (Air Canada doesn't fly to Cuba any more, and I'm not interested in Air Canada Rogue.)