From: John Dill <firstname.lastname@example.org> Date: 19 Apr 96 02:04:06
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The Boeing KC135 that NASA uses to train astronauts in simulated zero-g is the oldest one flying. (The Vomit Comet) I also believe it has the fewest flight hours. The Boeing Company monitors the aircraft on a regular basis as the airframe is constantly subjected to g-loads of +2 to -.1. The original straight turbojet engines are still installed and use water injection on take-off. It might also be the loudest transport aircraft still flying in the US.