It was flown by unqualified, unrated pilots, one of them a private pilot without an instrument rating, who was also the operator of the airplane. The flight was conducted under part 135. The "captain" had only a SIC rating, and the first officer had no rating. The pilot who had been assigned the trip had refused it, due to the condition of the brakes. The operator of the falcon, the private pilot, took the trip as the copilot, and hired an unrated pilot to fly it. From the video it's plain to see the aircraft wasn't slowing when it went off the end. The engines ran for almost 45 minutes after final impact, before fire-rescue was able to gain entry and shut it down.
The operator had a long history of conducting illegal charters.