Is there an aircraft that can go supersonic at sea level without using afterburner? Is there an aircraft that can go supersonic at sea level without using afterburner? Quick look through the "supercruise" capable aircraft might be helpful in narrowing down the possibilities, though I haven't seen anything specifying the top speed without afterburner and at sea level simultaneously. If I remember correctly, the F-15 is not capable of doing that; this gives you an idea, however, it's not the fastest jet in the world, so I'm still looking for the answer.
According to Wikipedia, the BAC TSR-2 was capable of supercruise (no reheat) at Mach 1.1 at 200 feet (~60 m) altitude.  The TSR-2 first flew in 1964.  The English Electric Lightning had demonstrated supercruise several months earlier, but only at higher altitudes (above 20,000 feet, appr. 6 km).