P-2E, Black Hills Aviation*, Klamath Falls, 09/92. SP-2E, Neptune Inc., 10/95. P-2E, Black Hills Aviation*, Eagle Lake, 06/93. MORE.... *Black Hills Aviation was founded in 1958 by Arnold Kolb. Black Hills Aviation operated Boeing B-17s from 1964-1980. Lockheed P-2V Neptunes were purchased in 1974, and sold to Neptune Aviation Services, Inc. in 1993.