AFTER LANDING UPHILL-to the left of the row of plastic sleds partially buried in the snow, to help glacier pilots judge their height above the surface-Chip Sonn prepares a K2 Aviation Turbine Otter for the return to Talkeetna, Alaska. The skiplane is at 7,200 feet msl on the Kahiltna Glacier; the base camp used by Denali climbers is a few hundred feet to the right. www.aopa.org/pilot AOPA PILOT | 71http://www.aopa.org/pilot