The MiG 1.44 finally made its maiden flight in February 2000, just nine years behind schedule, with test pilot Vladimir Gorboonov in the cockpit. During the 18-minute flight, the 1.44 reached a maximum height of 1,000 m (3,300 ft) and reached speeds of 600 km/h (370 mph).
Yet despite the YF-23’s performance bona fides, the jet was passed over – in large part, not because of the jet’s performance, but because of how the performance was marketed.
The biggest knock against the Su-57 remains its numbers – as Moscow simply doesn't have that many, and won't likely ever have the Felon in significant numbers.