Can you take gluten free food on an airplane in your carry on bag?
Jane Anderson from celiacdisease.about.com did a great job summarizing GF airplane travel:
The TSA should allow any form of solid food, although it will have to go through x-ray. Gluten-free items such as cookies, brownies, pretzels, chips, crackers and dry cereal, chicken, roast beef, ham, as well as fruit & GF bread should be allowed through security.
If it is liquid or gel-like (i.e. a dip, a spread, a dressing or even gel packs) it is more of a problem. These things aren’t banned, but only 3 oz. of each is allowed and must fit in 1 quart sized zip lock bag along with your toothpaste, shampoo, etc. Read more from celiacdisease.about.com