i don´t know if this is applicable, anyway...
since i haven´t paid close attention to a ground crew turning around an MD-80 for quite some time, i don´t know if the door on the left side of the fuselage just in front of the engine is opened for the ground staff to come in and clean the aircraft.
if this door is closed, and catering is already at door 1R, then the other ground staff must wait for all pax to disembark. thus, it takes longer to turn around the aircraft which is a big problem for low cost carriers aiming to get the aircraft back into the air within half an hour.
as i said, i don´t know if this is applicable, but that´s a reason why some regional airlines dislike the CRJ 900. it takes very long to have all pax disembark the aircraft. if there´s an aft door, cleaning personell can enter as soon as the crowd moves forward the cabin to exit the aircraft.
If only pure sweetness was offered, why's this bitter taste left in my mouth.