The intention of this paper is to discuss the advances in thrust engines from the initial development of the J58/SR-71 (JT11D-20) of the U.S. Air Force's SR-71 Blackbird to the development of the RAM and SCRAM engines necessary to propel the new generations of high-flying super-speed aircraft. Engineering complexities suggest that the engines and their development cannot be fully discussed without referring to the airframe and the integrated design and manufacturing required for the aircraft. A description of the turbojet engine, the fanjet engine, SR-71 development, and the Scramjet system are included. A picture of the F110-GE-100 engine airflow is appended. (KR)