15 November 1995, Valkenburg. N931NA is former USAF-tanker 63-7998. In 1995 the NASA used it for zero-gravity training. This 'Vomit Comet' made some flights from Valkenburg with students of the technical university. The Boeing is now on display at Pima Air &amp; Space Museum.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/109661044@N07">Rob Schleiffert</a> from Holland
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/109661044@N07/16783001558/">KC-135A NASA</a>