You're on a trip and the layover is at the airport hotel in a major hub. You don't want to spend $30 for dinner at the hotel. Do TSA rules allow you to go through security using your ID in civilian clothes to access the wonderful cuisine inside the airport? I heard somewhere that you can go in to conduct duty such as go to a crew area to use the computers for bidding or to check your schedule, but can you go in for non-duty purposes like eating? (although getting adequate nutrition at a reasonable price might be considered duty related).