L.,
Just a few ideas:
(we've flown many, many times with all 3 of our kids)
Buy a few new toys, books...etc and take them with you on the plane; get them out after take off. They'll be exciting since they are new.....try items that are quiet,(so not to annoy other passengers) but can last awhile...my toddler loves a peg board with pegs or colorforms that stick to a special board. My little one even enjoys listening to a CD player with kids' songs!
Also, I'm sure you've heard this, but have several different snacks and drinks for your little one....Cheerios, small cookies or crackers....and give them to your toddler especially during take off and landing, so their ears won't hurt. Or you can also use a bottle or pacifier during take off and landing. If you use a pacifier, bring several....it never failed that they always landed on the floor of the plane!
A little fyi: my kids usually got an ear infection after they flew on an airplane! my pediatrician did not believe my correlation between flying and ear infections....so, I started documenting each flight we took and when each of my kids' had ear infections! My kids were predisposed to getting ear infections anyway, but the plane ride precepitated it! So, I started taking Hylands' homeopathic ear infection remedy with me and gave the tablets during the flight and for 3 days after. (the tablets melt instantly in the mouth; I used it on a 6 month old) I also used garlic/mullien oil in their ears.....these 2 remedies usually helped! Plus, I carried my otoscope with me to check their ears.
I hope this helped a little,
Pam