You've been at 9000 feet for over three hours, the workload is increasing as you get ready to descend for the instrument approach and ATC is barking the orders faster than you can keep up with. A portable O2 system can ramp up your performance. Aithre's app-based monitoring, is a worthwhile backstop
We pilots must be nuts. We willingly strap ourselves into frangible vehicles with cabins smaller than occupied by a heinous criminal in solitary confinement and then climb to altitudes where our brains are deprived of oxygen to the extent performance of the tasks essential to a safe return to the planet is put at risk.
And then we do it again. And again.
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