From the “Not So Bright Idea” File

A jumbo jetliner that serves as Air Force One, escorted by a military jet, flew over Lower Manhattan Monday morning, frightening office workers and causing evacuations in what turned out to be a publicity operation approved by a unit of the U.S. Air Force.

At around 10 a.m. EDT, a Boeing 747 was seen accompanied by an F-16 fighter jet flying low over the southern tip of Manhattan and at one point seen circling the Goldman Sachs Tower in nearby Jersey City, N.J.

The circling planes were part of a "photo op," a Federal Aviation Administration spokesman said. …

…The low-flying 747 sent workers worried about a repeat of the Sept. 11, 2001, terrorist attacks fleeing their offices in the New York City area.

Traders bolted from the floor of the New York Mercantile Exchange after seeing the jets. The exchange, which sits on the east bank of the Hudson River in lower Manhattan and is blocks from the site of the terrorist-destroyed World Trade Center, didn't order an evacuation.

People trading oil, natural gas and other commodities on the Nymex floor apparently took no chances. A Nymex security official was "literally standing, holding his hands up in a calming gesture. Guys were running right past him," said Pete Donovan, a vice president at Vantage Trading in the crude-futures ring.

But several buildings in the area were ordered evacuated, although workers quickly returned after it became clear that the flyover was a planned event. …