Stumped by T.S.A. rules? Uncover the secret no-nos!

The answer to the crossword question “Some T.S.A. no-nos is GELS” is referring to the restrictions imposed by the Transportation Security Administration (T.S.A.) on carrying gels or liquids in carry-on luggage. When traveling, the T.S.A. has specific rules in place regarding the amount and packaging of gels and liquids that can be brought on board an airplane. These restrictions are in place for security reasons and help ensure the safety of all passengers.