If I remember correctly, TWA had lounges on wheels in the late 1970s and through the 80s. Not sure about the existence after that. TWA docked these mobile lounges to the aircraft allowing passengers to walk directly into the cabin. So cool!

SQ had beds with sliding doors on their B747s from the 1970s and well into the late 1980s known as the Slumberettes. These were booked out more than 6 months in advance and jealously guarded by the 'owner'. The aircrafts were deployed on the Singapore London route and v.v. There was a lounge with...