Originally Posted by graraps
used aircraft steps, platform stairs and jetways. But I can never recall boarding from the right-hand side of the plane. Nor have I ever seen a picture/film of somebody getting on/off the plane from the right hand side. I've disembarked from the middle of a plane once, flying MXP-FCO on AZ with a MD80 Super. Is there a reason for this practice?
In addition to the reasons
WHBM noted, on modern airliners, the galleys are usually on the right side of the plane (especially on narrowbodies) so the catering truck loads from that side. Also, the cargo doors are on the right (some regional planes excepted), and a jetway or staircase would get in the way (especially on widebodies which use huge LD-XX container loaders).