At 13:18 PST, a Grumman Gulfstream II was substantially damaged when it overran runway 16R after landing. The two pilots, flight attendant and sole passenger were not injured. Three parked and unoccupied aircraft were destroyed, one sustained substantial damage and another minor damage when the Gulfstream traveled into a tie down area. The GII departed Westhampton Beach, N.Y., at 09:57 EST on a Part 135 flight with eight passengers aboard. That flight terminated in Montrose, Colo., and seven passengers deplaned. The passenger told investigators the approach was steeper than any he had previously encountered and the speed was very, very, very fast. He pressed his feet into the seat back in front of him. He said the aircraft maintained its steep angle of descent and high speed until over the runway. After touchdown, there was a delay in thrust reversers being deployed and braking attempts did not feel successful to him; he could feel them cycle on and off. The jet traveled over a grassy area and back onto pavement, then the Gulfstream hit the parked airplanes and stopped. The crew tried unsuccessfully to open the entry door. When the passenger pointed out fuel leaking from the wing, the crew decided to exit from the back through the baggage door. An inspector measured 3,400 feet of skid marks on the 8,001-foot-long runway. He measured another 1,072 feet to the aircrafts final resting point.