Just FYI, on approach to LAX from AUS right now. Captain came on and explained that the jet stream is ugly today, and although skies are clear it's going to be a bumpy ride through the whirlpools and eddies, but that ATC is clearing folks to lower altitudes to get under it. Apparently quite a few of the planes ahead of us have reported it, too. He wasn't kidding. Not any sort of turbulence that should merit mechanical checks (yet), but it's definitely a rough ride. He's actually just asked the flight attendants to take ANY SEAT if they're up moving around. Haven't been on a roller coaster like this in a long time. Wondering if the fish quesadilla for lunch was the right idea... even with my strong stomach.