Built in competition to fulfill the role of the Air Force's requirement for a long-range penetration fighter and bomber escort, only two airframes were built, neither one surviving. The second airframe actually survived three atomic blasts at the Nevada Test Site.
Pyro's version was never marketed as the XF-90, but the similarities are too close. Toy companies didn't always acknowledge 'borrowing' their ides from existing aerospace designs. The rod sticking up from the fuselage on the toy was meant to accommodate a rubber tube which connected the airplane to a tower. I believe there were two planes connected to the tower and they revolved around it.
From Vegas Skunk Works
Ed
USA