 Partial internal compression was considered for the Concorde (the Supersonic Transport Aircraft Committee, in 1959, had recommended an SST to cruise at Mach2.2) but an "external configuration was chosen for the inherent stability of its shock system, it had no unstart mode".Even though there was some internal compression terminated by a normal shock local to the ramp boundary layer bleed slot inside the intake, the intake was aerodynamically self-compensating with no trace of any unstart problem.Early in the development of the B-1 Lancer its mixed external/internal intake was changed to an external one, technically safer but with a small compromise in cruise speed.