I opted to crochet on the a irplane rather than knit. I kept hearing horror stories about kntting being confiscated, plus crochet is easier to stop in the middle. I made most of a totally utilitarian dishcloth, I only needed to look up how to do crab stitch once we got here.
I also started the Stitch Diva Studios Broomstick Lace Jacket. I didn't get very far, it was hard to see in the airplane light. It's a bit bigger now.