Basically as I understand trans-Mach/Mach. Aircraft designed to do so have their wings and other horizontal airfoils designed to penetrate at the same time (many lost aircraft in this trial and error by the USAF).
When entering "Trans Mach" commercial airliners have to my knowledge fallen victim to the "Mach Tuck" where ther center of lift transverses aft of the wing (loosing all lift) while the stab maintains sub mach speeds (lift) creating what had been percieved by early aviators as a stall.
Mach tuck - Wikipedia, the free encyclopedia
As I understand the leading edge of the airfoils maintain a constant pressure after the transition to mach speed is achived. "the snail crept along the razor"....