B747, DC10, L1011, MD11....mach .83 to mach .85
 B727, B767, A300, A320,....mach .80 to mach .82
 DC9........................mach .78 to mach .80
 MD80, B737.................mach .73 to mach .76
 FK100....(get a life!).....mach .71 to mach .74

These speeds are of course up to the flight crew...I've had B737 pilots
in a hurry go mach 80...but they burn fuel like mad.