The Air Force One lookalike was to fly over New York Harbor so Air Force photographers could take promotional photos. But the exercise took place without any notification to the public, leading to momentary panic, per the Times.
Here's a look back at what New York City Twitterers were saying during the scare, beginning with the apparent first tweet on the incident.
Twitterers around the U.S. expressed astonishment at the incident.
For more information, the INDenverTimes provided a roundup of stories on the incident, complete with photos.