Ref wearing mil uniform on RAF flights...i was travelling to Afghanistan and we stopped off in Romania (dont think you do anymore). We were in uniform all the way and the hotel we stayed in (5*) didnt have a problem with ourselves in uniform.
But i agree with the US attitude to military. Arriving in Sanford Airport in Orlando i was asking for a up-grade and the girl on the rental desk spied my MOD 90 in my wallet. Seeing this she said if i was mil she could do a good deal...so from a crappy focus type car i went up to a Camaro convertible for only $10 extra per day! The Australians treat their forces in the same way as well..