Originally Posted by
tomgoodman
I think they only disarm the doors which will be opened for deplaning or for the catering truck. The others are probably left armed in case of an onboard fire at the gate, so you don't have a pile of squashed passengers on the ramp.
All doors are disarmed upon arrival at the gate, when the seatbelt sign is turned off. The announcement to "Crosscheck and All Call" is made by the A-line FA, not pilot. (Info courtesy of FA wife.) That said, there are some airplanes which have emergency doors and windows permanently armed. It is also concievable that he rearmed the door prior to opening it. It is not too hard to do, you just have to read the decals.