Many people, including investigators, are wondering how two planes could collide in mid-air. It happened Saturday and now officials are trying to piece together the pilots' final hours before the crash. Both pilots and one passenger died in the crash.

Joe Graves, 78, has been flying planes since 1955. A long-time Williston resident, Graves owns a Cessna 150.

Graves says he's had plenty experience flying all kinds of planes even experimental ones. And, when he heard of the two planes that collided in mid air Saturday, he says most likely it's not the planes that were faulty.

Investigators said the crash happened around 11:45 a.m. Saturday. The collision claimed the life of 71-year-old Lee Sentman. He was flying the RV6, an experimental plane.

The bodies found in the other plane, a Piper 62, have not been id, but local residents tell us the aircraft belonged to a German couple.

"We don't know nothing yet, the aircraft is scattered out about half mile in length and quarter mile in width," NTSB Investigator Butch Wilson said. "So we have a lot of reconstruction to do."

Investigators said the big question is what both pilots were doing hours before the accident.

The investigation has been turned over to the National Transportation Safety Board. They say their still conducting interviews.