Which is to say, I don’t get it:

A low-flying commercial jetliner, followed by a pair of military planes, flew low over the lower New York Harbor on Monday morning, skirting close to the Jersey City coastline and prompting evacuations of office buildings in Lower Manhattan and Jersey City, N.J.

Perplexed officials at the Port Authority of New York and New Jersey were inundated with calls from ferry passengers and residents in the area, but in fact there was nothing to be alarmed about. The large plane was a backup for Air Force One — a military version of a 747 commercial jetliner — and it was accompanied by two fighter jets, as part of a photo shoot, according to the Federal Aviation Administration.