10/15/2006. Remarks by Johan Visschedijk
: "Two TP-80C-1-LOs, serialed 48-356
and 48-373 were modified as Model 780 all weather fighter prototypes and were initially designated ETF-80C, changing to ET-33A when the TF-80C became T-33A on January 1, 1949. First flown from Van Nuys airport, California, USA, on April 16, 1949, by Tony LeVier and Glenn Fulkerson. The first seventeen production models were designated F-94A-1-LO, so the two prototypes, 48-356 and 48-373
unofficially became known as YF-94-LO."