How High Does a Plane Fly

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Here’s something to chew on while you’re sipping your ginger ale: at 35,000 feet, the outside temperature is about -60°F. That’s colder than a polar bear’s freezer. Yet the plane is built to handle it, and the cabin is kept at a comfortable 7,000-foot equivalent pressure. The windows are three panes thick—so thick that a bird strike would just annoy the pilot. (Probably.)

Also, don’t think you can just “jump out” from that height. Even with a parachute, you’d need special training and a pressurized suit. Without one, you’d black out in seconds from lack of oxygen, and your blood would start to bubble like a poorly opened soda can. So, you know, stay inside.

But how high is “too high”?

For a standard airliner, anything above 42,000 feet is where things get dicey. It’s known as the “coffin corner”—a nasty zone where the plane’s stall speed and its maximum speed get dangerously close. It’s like trying to balance a greasy spoon on the tip of a wobbly table. Pilots avoid it like a bad Yelp review.

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Still, some planes push the envelope. The Boeing 787 Dreamliner is certified to fly up to 43,000 feet. And the little Pilatus PC-24 jet? It can hit 45,000 feet, which is basically showing off.

So the next time you’re up there, staring at a wing that looks suspiciously like it’s flexing, remember: you’re cruising at a height that would make a mountain climber weep. The air is thin, the world is a blue marble, and you’re sitting in a metal tube that’s basically a very expensive, very fast aluminum can. And somehow, it all works. Just don’t ask the pilot to “floor it.”