A precise search area was difficult to define, as even small differences in estimates of the aircraft's speed, or the environmental conditions along the flight path (which varied significantly by location and altitude), changed Cooper's projected landing point considerably.[42] An important variable was the length of time he remained in free fall before pulling his rip cord – if indeed he succeeded in opening a parachute at all.[43] Neither of the Air Force fighter pilots saw anything exit the airliner, either visually or on radar, nor did they see a parachute open; but at night, with extremely limited visibility and cloud cover obscuring any ground lighting below, an airborne human figure clad entirely in black clothing could easily have gone undetected.[44] The T-33 pilots never made visual contact with the 727 at all.[45]

An experimental re-creation was conducted, using the same aircraft hijacked by Cooper in the same flight configuration, piloted by Scott. FBI agents, pushing a 200-pound sled out of the open airstair, were able to reproduce the upward motion of the tail section described by the flight crew at 8:13 pm. Based on this experiment, it was concluded that 8:13 was the most likely jump time.[46] At that time, the aircraft was flying through a heavy rainstorm over the Lewis River in southwestern Washington.[42]



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