With commercial aircraft flying slightly above Mach 0.8, is there any surface exposed to speed of air significantly larger, e.g. near Mach 1? ignoring:
- The engine components,
- The boundary layer as clarified by
Edit: Reading useful information provided in comments and answers, I realize the key notion is "critical Mach number", and the question boils down to:
Are commercial jets flying at critical Mach number speed or higher?
since the critical Mach number speed is -- by definition -- the one at which some airfoil portion experiments a supersonic airflow. See also: