The maximum speed of an airplane depends on the type of aircraft. The fastest commercial aircraft in the world is the Airbus A330Neo, with a maximum speed of 1,061 km/h. The Boeing B788 also has a high maximum speed, reaching up to 1,051 km/h.
It's important to note that these speeds are only achievable in ideal conditions and are not typical cruising speeds. Most commercial airlines cruise at a speed between 550 and 600 mph (478 to 521 knots).
The speed of an aircraft is also influenced by factors such as altitude, air density, and wind conditions. For example, airplanes can fly faster at higher altitudes because the air is thinner and offers less resistance.
