Jet Aircraft Travelling At Transonic Speed

The UK put the English Electric Canberra into service in 1951. Designed to fly higher and faster than any interceptor it carried no defensive armament.
BOAC operated the first commercial jet service, from London to Johannesburg, in 1952 with the de Havilland Comet jetliner. The Comet was initially ahead of rivals, but a series of crashes gave time for the Boeing 707 to enter service in 1958 and dominate the market for civilian airliners.
Turbofan aircraft began entering service in the 1960s and 1970s, and this is the most common type of jet in use today.
The TU-144 supersonic transport went into service in 1975, but soon stopped flying. The Mach 2 Concorde aircraft entered in 1976 and flew for 27 years.