“I'm not a teacher: only a fellow traveler of whom you asked the way. I pointed ahead - ahead of myself as well as you.”
― George Bernard Shaw

and check what you remember:
https://ed.ted.com/lessons/meet-the-bluefin-tuna-the-toughest-fish-in-the-sea-grantly-galland-and-raiana-mckinney#review

In 1996, a British Airways plane flew from New York to London in a record-breaking two hours and fifty-three minutes. Today, however, passengers flying the same route can expect to spend no less than six hours in the air — twice as long. So why, in a world where everything seems to be getting faster, have commercial flights lagged behind? Alex Gendler details the problems facing supersonic flight. Check out the video here.