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Kuiper
Airborne Observatory
The KAO was the only civilian C-141 in the world, and one of only 3 existing 'A' models. The other two are owned by the USAF. It was operational for over 25 years.
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Kuiper
Airborne Observatory
The KAO was the only civilian C-141 in the world, and one of only 3 existing 'A' models. The other two are owned by the USAF. It was operational for over 25 years.
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(NASA Ames
Research Center)