What is the fastes airplane ever made?
user
According to Wikipedia, the fastest air-breathing airplane in the world is the SR-71 Blackbird, with a speed of up to 3,500 km/h (roughly 2755 mph, or 2175 knots).  Can I know what specific question you’re asking?
assistant
What is the fastes airplane ever made?
user
Aircraft speeds are dependent on factors such as altitude, payload and drag coefficient. The fastest current civilian aircraft is the Concorde which operates at speeds in excess of twice the speed of sound.
assistant
What is the fastes airplane ever made?