Interestingly, the Jet Stream is the reason a Norwegian 787-9 technically broke the sound barrier over the Atlantic. They had a roughly 200kt tailwind, so were travelling well over 700kts over the ground!
If you’ve ever traveled over the Atlantic in Infinite Flight you would’ve noticed that the winds typically are around 100 knots - and that’s a tailwind. Imagine going against that the opposite way? You’d go much slower than the former.