The day before the crash, Zobayan had made the same trip from John Wayne Airport in Orange County, where Bryant lived, to Camarillo, near the Mamba Sports Academy in Thousand Oaks, where the basketball tournament was being held. Homendy said Zobayan had used a more direct route for the roughly 90-mile trip northwest, and that the skies were clear.

Homendy said the N.T.S.B.’s investigation would have been easier if the helicopter had either a cockpit voice recorder or a flight data recorder, neither of which was on board. She said that the helicopter was not required to have either type of recorder, but that the N.T.S.B. had recommended several times that helicopters like the one that crashed carry the devices as well as a terrain warning system that alerts pilots when they are too close to the ground.

Investigators have recovered the bodies of all nine victims.

Ever since the authorities reached the rugged hillside near Calabasas, Calif., investigators have been meticulously combing the crash site, using drone technology to survey the scene and manpower to delicately pick through the strewn, charred wreckage.

On Tuesday, the Los Angeles County coroner’s office announced that the remains of all nine people who died in the crash had been recovered. Three of the bodies were recovered on Sunday afternoon, officials said, but it took another day to locate the remaining six.

The authorities have publicly identified four of the deceased victims, including Kobe Bryant, based on fingerprints, but the names of all nine people have been released by family and friends.