Tip For Traveling with 3 year and 5 year girls

EXPO

I will go back China soon with my 3-year and 5-year daughter. I am afraid and don't know how to manage such long time in airplane. What should I prepare for this long trip?
1 f) ^+ }' P- N5 p! D9 o
8 @# W* m6 H/ k/ P- j( d( P3 h$ _& pThank you first!