Passengers had their very own compartments, sleeping berths and windows with a dedicated lounge located further along the cabin.

The impressive Boeing 314 Clipper, introduced later in the decade in 1939, was described as a flying luxury hotel with full-sized dining rooms available for passengers

The glorious 1930s. 

The dining room of the Boeing 314 Clipper. has cool pictures per decade.

Just The Flight's little interactive timeline about the evolution of the airline cabin is fun.

It's obviously not exhaustive and foregoes the debate about whether today's conditions are so much worse than the past with regard to comfort and ticket prices. I'll come back to that interesting topic.