Tks. We have booked a night flight already, departing around 12:00 mn. Under this circumstances, I think he'll sleep, as what you said, at least for several hours. I cannot sleep well in plane, so probably I can take care of him if he woke up. Tks for reminding, I think I need to fill up his bag with toys to make him more busy.
We're visiting my sis-in-law, she just bore a baby and we'll spend the christmas together. Depending on their condition, probably we'll go to Disney, or even the Universal Studio, since my son loves Spiderman.
I donno what's California Adventure, I may go to the web and do some searching on that.