I'm not sure you'd want to snap-roll a large transport aircraft, but you could probably barrel-roll one, including a B-747. The legendary Tex Johnson, chief test pilot for Boeing's 707 program, barrel-rolled the prototype 707 at a Gold Cup hydroplane race in Washington State. According to Clive Irving's book "Widebody" on the development of the 747, Johnson's explanation was that it was "a one-G maneuver. The airplane never knew it was doing anything but flying straight and level, with aileron deflection. I started at about four hundred feet. Applied up elevator, held the one G, put the aileron in. After the roll I was at sixteen hundred feet, climbed out during the maneuver. This is not risky. If you hold one G you don't uncover the fuel pumps. There's nothing that can happen to the airplane."
While the 747 is larger than the 707, it's not THAT much larger....
