TRAVELERS are welcome to bring their Thanksgiving leftovers on their post-holiday plane rides - except for one popular side dish. The Transportation Security Administration has strict guidelines for the millions of passengers traveling by air this week for Thanksgiving . Nearly all foods are allowed to be transported in checked baggage - but the rules get tricky when it comes to carry-on bags.

Solid food items can pass through a TSA checkpoint with no problem, but liquids have to be under 3.4 ounces. This means passengers have to be careful about how much gravy they bring on planes, as it counts as a liquid.

The TSA has this rule to prevent items from spilling, spraying, or pouring on the plane. READ MORE ON THANKSGIVING The rule also includes other Thanksgiving classics like cranberry sauce and apple cider. Any canned item also counts as liquid, so passengers must check they're under 3.

4 ounces or 100 ml as well. More holiday favorites like casseroles, macaroni and cheese, and stuffing can also be brought through TSA checkpoints. Food often needs additional screening at security, so TSA advises travelers to place items in an easily accessible spot.

Most read in Travel Fresh foods and cooked or uncooked meats like turkey and ham are also fine to bring through TSA, officials shared in a press release last year. When it comes to frozen food, the TSA has specific rules about the ice packs travelers use to keep their leftovers cold. Ice packs must be frozen solid and not melted w.