>>1575694Nasa used the tupolev because they didn't want to be accused of copying concorde technology to help boeing build the american supersonic transport. This being boeing, they failed so hard americans banned concorde by banning supersonic travel over land instead.
>>1571439Yes, fuel consumption is bad at supersonic speeds because you get extra wave drag and less lift from supersonic flow compared to subsonic flow. It's like displacement vs planing ships. The later are much faster, but it's the former that rule commercial shipping (for cargo and passengers).
Really, it wasn't the accident that killed the concorde, it was only an excuse for a managent that didn't want to waste any more money on it.