system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If the concord Jet was so great in 1986, why don't they make a modern day version that's even better and fixes the original problems?

a 3 hour flight from new york to london. why is this not a thing, if they could do it in 1986 why, with todays technology can they not make it even better.
gpt
We could, but its still expensive and few people would pay the extra price to just get there more quickly. Supersonic flight is just naturally less efficient than subsonic and as such will cost quite a bit more.