This NASA Spaceflight Tweet shows historical photos of (presumably) Antonio Elias wishing Pegasus well.
Question: Does anyone know roughly when were these Pegasus photos taken? Could they be circa the first flight in 1990? Before or after?
Clearly it worked in any case. After 25 years and 37/42 successful launches, Pegasus II is coming.
The tweet links to this article: Pegasus Celebrates a Quarter of a Century Milestone. Some more info and photos from that timeframe can be found in the video below.
Some more history from YouTube, including Kubrick's other propulsion-related film.