Damn!
I just wrote a long and detailed explaination for how those noise abatement procedures that you enjoy violate FAR 91.303 and the system just trashed my post. Anyway, that reg covers aerobatic flight. Strictly speaking, any abrupt manuever not necessary for normal flight is an aerobatic maneuver according to the FAA. Airliners are strictly prohibited from doing those maneuvers. That's why some pilots say they can't do a single flight without breaking some regulation. They claim that several regulations are mutually contradictory.