On VB flights its always 'arm/disarm doors and cross check' I think the cross check is important with something like arming/disarming the slides as its a second pair of eyes going over to ensure it is correct I mean in an emergency situation if the doors arent armed correctly you have a disaster on your hands and arent able to either evacuate the aircraft as quick or safely as if the slides are deployed properly also if they arent disarmed correctly on arrival at the gate you have a mamouth safety issue if a slide depolys.
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