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Check, check, is this thing on? Oh, wait, you mean a different kind of "check." We'll take off our roadie hats and strap on our life vests for the air flight safety procedures. Before a plane can take off, the flight attendants have to arm the doors. This doesn't involve weaponry -- it means the inflatable evacuation slide is secured to the door. You know, in case of "an unexpected landing." Before the plane's planned landing, the flight attendants have to disarm the doors so people can deplane. Because airplanes have doors at both front and back, flight attendants use the intercom to tell each other when the arming/disarming task is
complete. That's what they mean when they say "cross-check" plus the door identification. When they say "cross-check complete" it means all the doors are done. So now you can put your tray table up, return your seat back to its upright position, and rest easy knowing that the flight attendants have checked it all and are ready to rock out...er, fly.
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