Knitting Needles on Planes??

Yes, they are allowed. (If you still feel unsure call them and ask. I used to work for the airline and they were allowed...) Although they're sharp and can be used as a weapon. Nail polish, mascara, and screwdrivers are not allowed :o)

I fly a lot and love to knit on the plane. However, I use bamboo needles. I would think plastic would be fine, wouldn't try metal.

Anything that there is a doubt about you can probably pack in the checked bags. The enforcement varies between airports and TSA officials and if it isn't replacable I don't take it in the carry on. I have gotten so I only put clothes and the laptop in the carry on and check everything else. If you take much liquid or toothpaste something will be checked anyway.

Hello,
Here is the list of all the items not allowed on the airplanes.
http://www.tsa.gov/travelers/airtravel/prohibited/permitt...
Hope that helps!