. >> reporter: retired master sergeant craig stewart spent 24 years in the air force, 13 of those yearsthat is the same, the aircraft definition and that does not market if it's the president or your son or daughter. >> reporter: as a crew chief, he has seen a lot of the world while making sure all is right with the famous 747 in america. >> and if there is an issue with the airplan. can you stand there. >> reporter: sometimes you don't see your hotel room, sometimes, though, a crew chief can get a break, like on trips to rome. >> rome is with so much history. >> reporter: there are two identical 7 prisons, both air force one. >> sometimes when you were walking through the hangar and you see both of those planes there, that is one of the things where you can get used to it and every now and again, it hits you and sets you back to the first day when you walked in. >> reporter: the crew sits in a different area of the plane than the president. >> how's the food? >> pretty good. >> better than commercial airline food? >> yeah, yeah. >> this is an actual window? >> yes, it is. >> and this i