It is strange but in some aspects commercial passenger aviation
is lacking in passenger service & comfort levels that existed over
50 years ago! Nowadays, passengers are cramed inside like sardines!
On the Graf Zepplin, passengers had sleeping cabins - the use of dining
rooms & lounges - prominard decks, etc.
On the Boeing Clippers, passengers had sleeping berths similar to pullman
rail coaches and ROOM to walk around! No deep-vein thrombosis cases
on those flights!
I recall a comic strip in the early sixties called: "Frontiers of Science".
Very few of their aviation predictions actually made it to reality!