The maneuver you're describing is a barrel roll. You bring the nose up a little and feed in the ailerons and a little rudder (although the need for rudder depends on the airplane). Done correctly, you'll maintain 1G throughout the roll and the airframe will be stressed as though flying straight and level.
Tex did two barrels in front of the crowd that day, and Eddie Rickenbacker was reputed to a later said at a party at the Boeing CEO's house, "Damn Tex, why didn't you tell me you were going to do that? I would have rode in the jumpseat with you!" (or something pretty close to that). They had previously rolled the aircraft before on a test flight, so they knew it was safe enough to perform in front of the crowd. It was Tex's idea of "selling" an airplane.
I don't see why even the big stuff (747, L-1011, A340, etc) couldn't do the same thing.