Kind of, yes, but not exactly. The compression wave stops traveling forward at the building. The nose is still pressing air forward. The distance between the nose and building decreases faster than the air can get out of the way.
No, it would be from the leading edge of the airframe. The zones of compression are at the forward points of the moving object, and are variable with cross section. The wings and rudder will also have compression waves ahead of them but much smaller both in width and distance forward as they are quite narrow. The nose if the airplane is quite blunt and will push quite a large compression wave ahead of it. Supersonic aircraft and missiles have extremely pointed noses (and wing leading edges) so that the compression zone is as small as possible.
What the hell are you talking about? I'm talking about the big circular blink of light on the building itself right in front of the airplane just before impact. I'm NOT talking about any of the various sunlight or jpeg blinks flashes or squares at any other point in the sequence.
Again, what the hell are you talking about? The "flash" is not on the airframe, it's on the building. Change in velocity is irrelevant.
Space debris is traveling into air and compressing air as it goes. The air in contact with the object is the most compressed and gets hot enough to vaporize metal, or rock in the case of meteorites. The nose of an aircraft is rounded, so the air can't accumulate there and over heat the airframe. The SR71 Blackbird was capable of traveling at mach 3.3 or so (or mach 4.5 , depending on whether you buy the official specs or unofficial reports of radar data from Finland) and actually gets extremely hot.
The compression effect is noted only when something gets in the way.
For those airplanes, at those speeds, it's the buildings.
For space debris entering the atmosphere, at their enormous speeds, it's the air, which can't move out of the way, gets compressed, and heated.
Look up how a sonic boom is generated.
Ok so what you both are saying is that what was going on with both A/C should resemble falling space debris. Like a falling meteor. But if you look at a falling meteor (below) you can see it doesn't look the same. The flame (or light) is encircling the meteor equally. We don't see that in the case of either A/C. The flash appears to be on the lower right hand side of the A/C only and is not "encompassing" (for a lack of a better word) the nose.