She straightened the scarf at her collar until the fabric lay perfectly, and looked straight at Caldwell.

“Sir, I need you to step back behind the blue line until the passengers ahead of you have scanned,” she said.

Her voice was overly cheerful and professional, each phrase delivered with careful pauses.

“I’m Harrison Caldwell. Seat one B.”

“I understand, Mr.

Caldwell,” she said.

“Please wait one moment.”

Caldwell crossed his arms and tapped his silver watch against the side of the plastic podium.