If everything goes OK then you could make an 11:15 a.m. flight out of Long Beach. You need to fill out your disembarkation form and let the front desk know you have an early flight to make sure you get off as soon as the ship is cleared. I also advise using a taxi rather than the ship's shuttle.
Also know that with the recent incidents it will take longer to get through security.
There are things that can and do happen to make getting off the ship take longer. If you are willing to take the gamble then go for the 11:15 a.m. flight. Just remember if you loose the ramifications are yours.
I would probably get a later flight unless the price of the 11:15 a.m. flight is so good it is worth the gamble.