Not only that, but the faster you want to make an aircraft move through the air, the more precise your engineering needs to be. Precision engineering at those levels is pretty much insanity. It's why the Blackbird was so technologically incredible but also such a maintenance and engineering headache. One small thing that goes wrong at such a high velocity and that's it. The whole thing can shred to bits from small unintentional vibration. It makes travelling that quickly not worth the risk for public use.