Critical Mach number

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What Wikipedia says

Airliners cruise at speeds just below the speed of sound. An important speed which the aircraft flies through just before reaching cruising speed occurs when the air flowing over the wing reaches the speed of sound. It is known as the critical Mach number (Mcr).

Excerpt from the Wikipedia article “Critical Mach number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Efcuse, CC BY-SA 4.0, via Wikimedia Commons.