Three fire department commanders, who were in charge of firefighting and rescue efforts after the crash, had never taken a required training course for aircraft disasters, according to the San Francisco Chronicle.
The fire chief said it was not vital that commanders take the disaster course, calling it "very specialized training."
On Tuesday in Washington, D.C., federal officials plan to hear from witnesses, the FAA, Boeing, and others about the crash.
The four pilots on board will not be attending the hearing.
Three teenagers were killed, and more than 180 passengers were hurt.
NBC Bay Area's investigative Unit is heading to Washington, D.C. for the hearings.
Stephen Stock will have live reports on the investigation.