And then you can issue a silent alarm where in a few seconds or minutes somebody will show up to the gate and question that particular passenger.
CNN: Facing up to airport security fears
Not knowing whether somebody is going to show up with a gun or not.
NPR: Former Ameriquest Workers Tell of Deception
The two main characters spend the entire play waiting for somebody named Godot to show up, but admit that if he did arrive, they might not recognize him.
FORBES: Budget Uncertainties Provoke Panic In Defense Sector
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