Yesterday Air Force One (the US President's jet) was seen flying low over the New York skyline. The intent was to get photos of it passing over the skyline and Statue of Liberty for postcards and such. Similar photos have been taken at other national landmarks such as Mount Rushmore.
For whatever reason, they kept the planning of the event on a "need-to-know" basis. It went on to prove one thing: terrorism works. Everyone panicked when they saw it. They all ran out of the buildings and into the streets, thinking it was a repeat of 9/11. Obama was not on the jet, and was "furious" when he found out about the stunt.
They should have informed the public before they did it. Not only to avoid the panic, but also to allow other photographers a chance to prepare for it.