J.
Two words: DVD player! Also small snacks, small new toys (or hide some for a few weeks), Color Wonder markers that don't color the seats/tray tables. Get up and walk around whenever you can, esp. since you're pregnant and will need to go to the bathroom :-) Your six year old will be fine to leave in his seat while you walk the little one. Also, take a stroller even if all you do with it is carry your stuff. They will gate-check it and have it waiting for you in Oregon. My neighbor has a cute little harness with a teddy bear on it, you could consider that for your almost 2 year-old just to keep track of him in airport--or strap him in the stroller. You'll be fine--it may even be fun :-)