I think I'm right that one critical difference from the Concorde is that the TU-144 required afterburner use at all times during supersonic phases of flight, which was probably one reason why it burned a hole in the operator's pockets even more than Concordes did, not to mention bring a large range limitation. I don't think it ever carried passengers commercially (so far as anything was commercial in the old Aeroflot days) and it was reduced to carrying boxes.