Cruising. For most commercial airliners, the airplane's cruising speed ranges between 550 and 600 mph (478 to 521 knots).
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Examples of Specific Aircraft SpeedsPassenger planes like the Boeing 747 or the Airbus A380 usually fly at 500 to 600 mph. They're capable of going a bit faster but it's more efficient to cruise at these speeds.
On Tuesday, during a placid evening in central Pennsylvania, a Boeing 787-9 jet was shooting through the air at one of the fastest speeds ever achieved by a commercial airliner.
(a) Unless otherwise authorized by the Administrator, no person may operate an aircraft below 10,000 feet MSL at an indicated airspeed of more than 250 knots (288 m.p.h.).
Typical commercial airplanes are not designed to fly faster than the speed of sound, also known as Mach 1. If they get too fast, the air begins forming shockwaves along the wing that can cause the aircraft to become uncontrollable. The speed they cannot exceed is called the Maximum Mach Number, or the Mmo.
Airplanes are fast and efficient because they can operate in a low friction environment. There are no wheels (at least in flight) that have to be constantly be rolled over the ground, and at higher altitude the air is thinner which reduces air drag dramatically.
In jet aircraft, an overspeed results when the axial compressor exceeds its maximal operating rotational speed. This often leads to the mechanical failure of turbine blades, flameout and total destruction of the engine.
Whether flying at night or during the day, pilots need to see some kind of horizon. They use this to determine the airplane's attitude. At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres.