Originally Posted by
helopat
why multi crew airplanes put the captain in the left seat is anyones guess.
Most probably due to aviation's 'nautical heritage'. Ships would dock into port on the 'Port' side (because the starboard side had the 'steering board' on it). Therefore, passengers always load from the port side.
Now carry this over to aircraft (which they have). If you then put the Captain in the left hand seat, it allows him/her to easily monitor the loading by looking out the port window!
OTOH, it might be just that the majority of multicrew aircraft were first developed in countries which drove on the right hand side of the road (hence the driver sits on the left). Maybe the designers just carried over this principle...