I had to travel with my then almost 2 year old and 2 1/2 month old. It was an aweful trip! The first flight wasn't so bad. We left mid-day. My 2 year old slept a little on the plane. We traveled on a slow day so there were extra seats to change the kids on. The flights home were the worst. They were overbooked and late at night. My 2 year old was so tired, she just screamed and cried until the plane took off (which was a while). The trip was unexpected so there were many things out of my control. I don't think I'll travel like that again for a long time, but if I had to, these are some things I would do:
1. Take a flight that departs as close to nap time as possible. Too early and they won't sleep, too late and they will be over tired.
2. Take toys and snack. The airlines don't give you anything for free anymore. Take cash in case you want to buy snacks, blankets, pillows, etc.
3. Use a double stroller in the sirport if your older one will stay in it. It keeps everyone contained, you have someplace to put your stuff so you don't have to carry it, and you can walk faster to get to a place where you can all relax. If you don't take a stroller, I would use one of those leashes. One less thing to have to worry about.
4. Don't bother weighing down your carry-on with too much for you. You won't have time to read a magazine or touch up your make-up. It's just more to carry.
5. They say to stay hydrated, But you won't be able to go on the airplane. Drink only what you can get out before you board and then rehydrate when you get where you're going.
6. Ask for help when you need it. Most people are more than happy to help. People will probably be asking to help you anyways.
7. Bring a change of clothes for each of the kids and a shirt for you too if you have room. Kids make messes.
8. A blanket can be the most versitile item. It can be a play spot, something to warm a sleeping child, a peek-a-boo game, rag to clean up a mess, cover for a mess you can't clean, pillow, comfort object, instant calm for a baby (I put mine over my baby's head to block out light, noise and plain caos). Bring a good one!
9. Get there early. It's one less thing to worry about. Plus, it will give your children time to play a little before they get stuck on the plane.
10. Change/potty everyone right before you board.
11. Board the plane towards the end. There will be nice people to help you and your kids won't be stuck in their seats for an extra 20 minutes.
That's all I can think of. Hope it is helpful. Good luck!! I'd love to hear about how it goes and anything else you come up with to help.
D.