Here’s what the TSA emailed me about traveling with food (I’ll be taking our wedding cake top tier).
When traveling with food, the following tips may be helpful:
Single serving packages of condiments will be allowed but must fit inside your One (1) clear zip-top quart size plastic bag
Solid foods that have been frozen must be securely wrapped
Gel packs are not allowed to refrigerate food, only medication
Beverages brought from home or purchased before reaching the security checkpoint must be discarded unless they are in a 3 oz. or smaller container and fit comfortably in your one quart-size, zip-top plastic bag
After clearing security, travelers can now bring beverages and other items purchased in the secure boarding area on-board aircraft
Passengers are allowed to travel with pies, cakes and other bakery products through security checkpoints. However, doing so may necessitate random additional screening prior to boarding.