Republic had intended to also build an airline version of the aircraft to be known as the RC-2. This variant was supposed to be a "stretched" version of the XF-12, growing in length from 93 ft 9 in to 98 ft 9 in, with the addition of a fuselage "plug" in front of the wing. Also the complex Plexiglas nose section was supposed to be replaced with a solid metal nose with a bifurcated windshield. Fuel capacity would have been increased, and more powerful (at lower altitude) P&W R-4360-59s would have been substituted in place of the P&W R-4360-31s on the U.S. Air Force version. The engines also would have only had one General Electric turbosupercharger each, instead of the dual arrangement on the U.S. Air Force model. The aircraft would be lavishly appointed for the 46 passengers and seven crew. It would have been fully pressurized to sea level, air conditioned, with an electric galley providing hot meals and with an inflight lounge. It would have had the ability to cruise above the weather at 435 mph at 40,000 feet. No versions of this aircraft were ever built.