Just flew with my similar 10 mo. ds - and have to fly back the day after tomarrow.
Bulkhead, bulkhead, bulkhead!
I second the tape, also a Slinky, small board books, puppets, stacking blocks, ice chips, a bagel (there went my "no wheat until he's 18 months" plan) and our hip carrier.
Wish for nice seat neighbors - that alone provided a bunch of fun!
Good luck - my friend reminded me as I left that 1) it is never as bad as you think it will be and 2) you will never see these people again in your life, so do what you need to do for your child. Most people are very kind and those that aren't probably never had children or feel guilty about how they treated theirs!
I did carry a children's glycerite tincture with catnip, skullcap, valerian, chamomille and lemon balm in it, as well as Rescue Remedy and homeopathic Chamomilla - you can find some version of all of these at a coop/herb store etc...Didn't have to use them, but was glad to have them just in case. Plus ds love to shake the homeopathic tablet bottle! Another makeshift toy!