let's talk oxygen. Here's a quick Bold Method quiz:
https://www.boldmethod.com/blog/quizzes ... uirements/Another Bold Method man-splainer (sorry ladies, we're thick in the head):
https://www.boldmethod.com/learn-to-fly ... n-systems/And for those of you just wanting to scare yourself:
https://fearoflanding.com/accidents/acc ... alitta-66/And finally, while most of us won't be tooling along in the upper flight levels, here's a good overview of high altitude flight operations. I especially like the Garmin Auto-Descent function (for those of you who have not used this feature it's the "press any key to continue" function in the Garmin GXXXX panels.
https://www.youtube.com/watch?v=PLG2WMpRpl0Editors note: How do those tiny little wings on the Cirrus bug smasher keep that thing aloft at FL250?