Airplanes with seats that slowly move around the cabin, changing orientation, position, and neighbors.
Less monotonous flight, more fun.
No need to sit next to people that annoy you.
Increased likelihood of having a chat with interesting people.
Everyone gets to stretch their legs when their seat happens to be in a favorable position with more room in front of them.
At lunch/dinner time, all the seats could drive through the kitchen area.
When people embark on the plane, the seats are arranged in standard formation. In front-facing rows and attached to several neighboring seats.
After takeoff, the seats slowly/unobtrusively start to move around. Each seat also swivels around its axis. The seats move around a railing system which prevents them from detaching. It is physically impossible to pull a seat off the rails.
There is an option to lock a few seats together. If people want to stay together at all times.
The seats move around seemingly randomly, but there is a neural network powered software that plans the moves so that every passenger has the most room and a good time. The software also makes sure the weight is evenly distributed throughout the plane at all times.
The same system could be used on any long-duration public transportation.