The Jet Stream is a geostrophic wind blowing horizontally through the upper layers of the troposphere, generally from west to east, at an altitude of 20,000 - 50,000 feet.
NASA SVS The Polar Jet Stream
What Is A Jet Stream? - WorldAtlas
What influences the position of the jet stream? - Quora
What is the jet stream and how does it work?
Jet Streams PBS LearningMedia
The Jet Stream National Oceanic and Atmospheric Administration
Jet Stream
What we talk about when we talk about the jet stream and El Niño
NASA SVS European Jet Stream
How does the jet stream affect my flight time?
Do planes ever fly against the Jet Stream and why? - Quora