The myth of Concorde's inefficiency is pervasive, but Concorde was reasonably fuel efficient and generally brought a lot of income at least to British Airways.

The myth of Concorde's inefficiency is pervasive, but Concorde was reasonably fuel efficient and generally brought a lot of income at least to British Airways. It's engines were efficient enough that it supercruised at Ma 2.0, something only matched by few models of Tu-144 (there were multiple with different engines, not all of them supercruising), combined with high altitude it could use many efficiencies not available to other airliners. Ultimately it was maintenance issues (which in turn were caused by corporate political fights) and 9/11 (which required expensive modifications) that killed Concorde, not fuel costs - all combined with BA finding out that they could well enough replace the super-profitable Concorde routes with other aircraft and still make a bank even if individual tickets had to be made cheaper.