Chuck Yeager is an American test pilot who was the first person to cross the sound barrier to the point where an excessive object (like an airplane) passes the speed of sound. Yeager made his historic flight on October 14, 1947 on a plane called Glennis Glamorous, after his first wife.

When the aircraft began to reach close to sound speed, it was perceived that these effects constituted a barrier that made speed very difficult or impossible. [.] In 1947, it was shown that flight safety at sound speed was achievable in aircraft designed for specific purposes, which broke the barrier.

The loudest sound possible on the Earth's surface is 194 dB, i.e. when the amplitude of the sound wave is so intense that the low pressure part is a perfect void (the wave alternates between two times the normal atmospheric pressure and there is no air for what you don't want to be present).

The acoustic insulation is short for noise reduction windows that block up to 90 to 95 noises from the windows. Its base window, with a panel, has an average STC rating of 27 a double panel window has an average STC rating of 28.

When the aircraft began to reach close to sound speed, it was perceived that these effects constituted a barrier that made speed very difficult or impossible. [.] In 1947, it was shown that flight safety at sound speed was achievable in aircraft designed for specific purposes, which broke the barrier.