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My understanding is that a normal jet aircraft will have a real hard time approaching and breaking the speed of sound at whatever density, temperature it's at. This is because at the speed of sound, the cone shaped shock wave would intersect the relatively wide wings causing drag and mechanical shock. And that is why supersonic aircraft are often Delta wing shaped, ie. they have very triangular swept back wings that fit inside the shock cone so this doesn't happen. Also for the same reasons the shape of the nose in supersonic aircraft is very different from the subsonic rounded shape of normal passenger jet airplanes.

But I'm not an expert, just repeating what I've heard vaguely...

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