We flew with DS when he was 8 months, 2 flights in one day, both 1.5 hours long.
Definitely agree to bf or bottle on take off and landing. Landing is far worse than take off IMO, and even though I b'fed DS on the way down, it still hurt him and he cried in pain a fair bit. But as soon as we landed he was fine. Be prepared to have a bubba in pain for a little while, and just remember there isn't much you can do for them but lots of cuddles and remember that it won't last long.
Also, make sure you have lots of toys etc on hand to keep them amused.
Most people are quite considerate and understanding of having a baby on a flight so don't worry about that side too much.
Hope this helps