A jet stream of over 200 mph is impacting flights across the eastern United States. The impacts of this can be positive or ...

At least two flights briefly traveled faster than the speed of sound as the jet stream sped up, but there would not have been a sonic boom.

For both events, you can blame the jet stream – the fast-moving air currents that flow west to east around the globe. In October 2024, the polar jet had buckled, trapping a high-pressure ...