If you're going to do it, just put it in your ass, but make sure it's sealed in enough bags, so the weed doesn't get shit on it.

if you don't want to do that (it's probably the best idea), then I'd just put it in your pockets, that way you can ditch it if you have to easier, and it won't set off the alarm, and it won't go through x-rays. Just make sure it's with YOU. Otherwise it's easier to get caught, if it's in a bag or something, and sometime they search purses, etc... so I"d say your ass, or your pocket, or just get something to eat at the airport, and put the baggie inside whatever you get to eat, get on the plane, go to the bathroom on the plane, and put your shit back in your pocket....

My best advice would be just to keep it with you.
Good luck.