Or perhaps both an airplane and a helicopter?

The Latest on the Crash

Last Edited: Wednesday, 11 Oct 2006, 3:25 PM EDT

Created: Wednesday, 11 Oct 2006, 3:14 PM EDT

A small aircraft crashed into a building on the Upper East Side.

NEW YORK (AP) -- A small plane crashed into a high-rise
condominium Wednesday on Manhattan's Upper East Side, touching off
a raging fire that sent a pillar of black smoke over the city,
police said. There was no immediate word on any deaths or injuries.
   It was not immediately known if it was terrorism.
   Flames could be seen shooting from windows on two upper floors
of The Belaire, a 50-story tower on East 72nd Street, close to the
East River. Burning debris fell on the streets below as
firefighters shot water streams of water at the flames from lower
floors.
   Fire Department spokeswoman Emily Rahimi said the aircraft
struck struck the 20th floor.
   The tower was built in the late 1980s and is situated near
Sotheby's Auction House. It has 183 apartments, many of which sell
for more than $1 million.

Yep, it's both ;).

Helicopter crashes into UES building

FBI spokesperson: No indication of terrorism

Eyewitness News

(New York - WABC, October 11, 2006) - The FDNY has confirmed that a helicopter flying in an exclusion airspace crashed into an Upper East Side building Wednesday afternoon. A spokesperson for the FBI says there is no indication of terrorism in the crash.

Several windows of an apartment were blown out in an apartment building at the Belaire building on 524 East 72nd Street, between York and East End Avenue.

An eyewitness who saw the crash said she saw a "huge fireball."

Eyewitness News' Shannon Sohn was in Newscopter 7, watching the raging fire that sent a pillar of black smoke over the city. There was no immediate word on any deaths or injuries.

The Belaire is a high rise building near the Hospital for Special Surgery. A fire was reported on the 41st floor after the crash. FDNY crews are on the scene working to put the blaze out.

The New York City Red Cross said it is mobilizing and heading to the scene.

The incident's affecting traffic: The MTA says bus service in the area will experience reroutes and delays.