In Terminal A, the Continental, Delta Shuttle, Frontier, and Midwest Express ticketing counters are all together in a line. Behind, the gates for said airlines are split into two sections. Behind, there is a small Cape Air check-in desk, with the "gate" (a stairway) directly beyond. I'm 99.9% that there is a single x-ray machine at that door. If not, I don't where they screen the pax.

I hope that helps, even though my answer is not definitive.

ESPNfan