Newly released air traffic control tapes show American Airlines Flight 587 which crashed into a New York City neighborhood last November took off without problems.
However, pilots were warned of air turbulence from the plane that preceded it.
The tapes were released by the U.S. Federal Aviation Administration. They contain no transmission or conversations between Flight 587 and the control tower at the time of the crash.
Shortly after the plane took off, a pilot on another plane reported, "there's an aircraft crashing."
The American Airlines jetliner slammed into a residential area minutes after taking off from John F. Kennedy International Airport in New York. All 260 people on the plane and five on the ground were killed.
The cause of the accident is still under investigation.