As an airline employee, let me explain that one for you. We can go back and forth at will while doing our jobs. When we do that we can take bottles of water, yogurt in our lunches, etc. But if it goes on a plane, it has to go through screening. So if I get off work and decide to hop on a plane somewhere (and I’ve done that), I have to back up and go through TSA first. The sign is to remind us.
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As an airline employee, let me explain that one for you. We can go back and forth at will while doing our jobs. When we do that we can take bottles of water, yogurt in our lunches, etc. But if it goes on a plane, it has to go through screening. So if I get off work and decide to hop on a plane somewhere (and I’ve done that), I have to back up and go through TSA first. The sign is to remind us.