At the start of the commercial jet age, at the end of the 1950s, cruise speeds were about 450 knots. The majority of turbofan-powered aircraft in today's world fleet have average cruise speeds of about 500 knots (Jane's, 1998).
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This crisis forced airlines to search for ways to save on fuel costs, which led to a gradual reduction in cruising speeds. For example, the Boeing 707, a popular airliner in the 1960s, had a cruising speed of around 600 mph (966 km/h).
The maximum speeds of high-technology operational aircraft are seen to increase steadily from about 125 miles per hour in 1920 to nearly 450 miles per hour in the World War II years.
Seventy-five years ago, on October 14, 1947, the Bell X-1 Glamorous Glennis, piloted by U.S. Air Force Captain Charles E. “Chuck” Yeager, became the first airplane to fly faster than the speed of sound (Mach 1). The experimental purpose-built aircraft reached 1,127 kilometers (700 miles) per hour (Mach 1.06).
The cruise speed of 1940s propeller-driven aircraft increased from about 100 to 300 knots over a period of 20 years, as shown in Figure 7-1 for Boeing and Douglas aircraft (Condit, 1996). At the start of the commercial jet age, at the end of the 1950s, cruise speeds were about 450 knots.
Cruising speeds for commercial airliners now range between about 480 and 510 knots, compared to 525 knots for the Boeing 707 during the 1960's, according to a 2014 article from the MIT School Of Engineering.
People also forget that well into the 1960s, air travel was far more dangerous than it is today. In the 1950s and 1960s US airlines experienced at least a half dozen crashes per year – most leading to fatalities of all on board.
Very expensiveIn the 21st century, air travel is relatively cheap, but in the 1950s, you could expect to pay 40% or more for the same ticket you buy today. A ticket on TWA in 1955 from Chicago to Phoenix, for example, cost $138 round-trip. Adjusted for inflation, that's $1,168.
Flying Is Only Getting Safer Over TimeGlobal flight accident rates have been steadily declining over the years for a number of reasons, according to the International Civil Aviation Organization (ICAO).
Aircraft age is not a safety factor. However, if the aircraft is older and hasn't been refurbished properly, it may cause flyers some inconvenience such as overheating, faulty air conditioning, or faulty plumbing in the lavatory. More important than an aircraft's age is its history.