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The radar sweep painted Sector 7 in clean green arcs. Ramirez counted the returns twice, once against the strip board, once against the live feed. All commercial traffic was accounted for—three heavies on the arrival stream, one corporate Lear climbing through eighteen thousand. The only extra paint was a faint primary return at FL310, twenty-eight miles west of waypoint KELSO. No secondary. No data block. Then the transponder lit. Four digits, centered and unambiguous: 7500. Ramirez’s hand moved to the keyboard before the rest of her registered the number. The code was not in the active block list; it hadn’t been issued in the national database since the 2008 revision. She typed the query anyway. No match. No flight plan, no beacon code reservation, no military exercise tag. The aircraft continued straight, no turn, no altitude change, closing the sector boundary at 480 knots. Ninety seconds, she told herself. That was the window before the return crossed into the next center’s airspace or, worse, into the ADIZ buffer. She keyed …