At 40,000ft the speed of sound is lower than at sea level. High altitude bends sound upward, so cruise noise is often faint on the ground, and even sonic booms may not be heard.

Sonic booms from the sky: What fighter jets sound like at 40,000 feet

In a successful test, a supersonic aircraft—which has the nickname “Son of Concorde”—came close to the speed of sound Mach 1 on Tuesday (Nov 5). This aircraft can now help travellers fly between New York and London in only three and a half hours.

THIS supersonic jet flies at speed of sound, can travel from London to NYC in 3.5 hours

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Sonic booms from the sky: What fighter jets sound like at 40,000 feet

THIS supersonic jet flies at speed of sound, can travel from London to NYC in 3.5 hours