On this drawing, labeled passenger.jpg,

is the compartments.

only 2 levels to adjust to the height of the blue cylinder.

 

in this drawing,

color blue = tracks for the second floor seats.

orange = seats that travels up the blue tracks for the second floor.

so instead climbing a ladder, the 2nd 'floor' occupant can sit down to reach the ground.

 

on the opposite end of these compartments, will be the lockers for storage.

airline workers will travel in-between those compartments.