The Convair YF-106A (F-102B) Delta Dart here in 1957. Convair’s chief test pilot, Richard L. “Dick” Johnson, took the delta-winged interceptor to Mach 1.9 at 57,000 ft on its first flight 26 Dec 1956. Edwards History Office file photos
This was the prototype provided by Convair as per the 18 April 1956 Air Force finalized F-102B production contract with Convair. It was the only aircraft to carry the 'YF'-106 MDS designation as well as the FC buzz code as being an F-102B.