Chief Oreo Palmer radioed from the 78th floor of the South Tower
Reports from Firefighters at the Impact Zone Inside the South Tower
The New York Times revealed the existence of a 78-minute audiotape of radio transmissions of the New York Fire Department (FDNY), which proves that at least two firefighters reached the 78th floor sky lobby of the South Tower. 1
Excerpts From Firefighters' WTC Tape on 9/11
For well over a year, the Port Authority of New York and New Jersey refused to release the audiotape of firefighters' communications from the World Trade Center during the September 11 attacks. In early November 2002, the tape was released to the New York Times, then to other unspecified "news outlets" (according to the Associated Press). To my knowledge, the NYT is the only outlet to post excerpts from the tape; no one has yet posted the entire thing.