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CLEAR CREEK COUNTY - The three people who died in a single-engine plane crash in the Loveland Ski area on Monday morning have been identified.

The three plane occupants were James Kerker, 43, Amy Kerker, 39, and Lucas Kerker, 6. They were from Raymond, Ohio and were traveling on a family vacation, according to Clear Creek County.

Their aircraft, a Piper PA 28-235, took off from Rocky Mountain Metropolitan Airport in Broomfield at 8:10 a.m. on Monday before crashing less than an hour later.

The plane that crashed was registered to the James Kerker. His certificate was issued two years ago.

According to Loveland Ski area officials, the plane crashed a few terminals from the top of the Chair 5 lift line but did not hit the lift lines or damage the lift. It was also near the Third Valley lot.

"I was hiking up near Herman Gulch," witness Rico Argentati told 9NEWS. "I was about 11,700 feet up, and I just stopped to take a break, and I heard this plane coming up the valley. I knew right away it was too low. It flew past Herman Gulch trailhead ... it tried to turn around. It made a 180-degree turn to the left, and it dropped below the ridge of Mount Sniktau. And I said 'Oh my God, this plane is in trouble.' I was hoping it would come over the ridge, and it didn't. It crashed just on the other said of the ridge, and I saw a huge plume of smoke coming up."

PREVIOUS STORY: 3 die in small plane crash at Loveland Ski area

The Kerkers crashed on the edge of the trees. There was snow on the ground, so officials said that helped minimize fire potential.

The National Transportation Safety Board is still investigating the crash. The investigators believe the Kerkers were heading to Moab, Utah.

"We take a hard look into human performance and we take a look at the pilot's background, experience. We look at the weather conditions," said the NTSB's David Bowling.

While it was a clear day, 9NEWS Aviation expert Greg Feith said flying over the mountains, during the summer, creates a special set of circumstances.

"The big issue with the density of air here in Colorado in the summertime is that as temperature goes up, the density air decreases," Feith said. "And airplanes are density altitude sensitive. That is, the more dense the air, the better the performance. The less dense the air, it has a significant reduction in performance, on both the capabilities of the wing to produce lift and the propeller to produce the thrust to cause the plane to fly. And pilots have to be aware of that, they have to calculate that-- because you can run out performance."

Feith also said many planes that crash in that area do so because pilots follow the highway, thinking they have a clear path through the mountains. When they come to the Eisenhower Tunnel, they realize they have to turn left or right because they cannot go over the mountain. Feith said small planes do not have enough performance to out-climb the terrain, so the plane can stall out and crash. It is unknown at this time if this is the reason for Monday's crash.

(KUSA-TV © 2014 Multimedia Holdings Corporation)

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