Maybe not. The hijackers would have tried to fly as low as possible toward the target, a very risky maneuver with a large commercial aircraft, and might well have hit the water. Also, the passengers might have stormed the cockpit once it was clear they had been hijacked.
With nobody taking credit for anything anywhere, it’s starting to look like either we or Malaysia shot it down. Targets either DG or the Twin Towers in Kuala Lampur.