Concorde was sustainable. Almost everyone of them left the ground full. But these were planes built in the 70s. The rest of AF and BA fleet are fairly new with

Concorde was sustainable. Almost everyone of them left the ground full. But these were planes built in the 70s. The rest of AF and BA fleet are fairly new withe oldest being from the mid 90s. The planes were getting more expensive to maintain and there was nothing coming to replace them.