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Re:The Celera 500L aircraft may fly soon by kenneth on Saturday June 08, 2019 @07:50AM (#20131897)
The higher you go, the tighter your flight envelope gets as you approach the "coffin corner" and the more likely you are to stall. A stall is very bad (you lose lift and fall out of the sky).

https://en.wikipedia.org/wiki/Coffin_corner_(aerodynamics)

Re:The Celera 500L aircraft may fly soon by hollerith on Saturday June 08, 2019 @07:57AM (#20131914)
Stalls are very bad when the aircraft is close to the ground. Stalls at about 5000 feet or more above ground level can be recovered from reliably by professional pilots, which is why (combined with the existence of autopilots and the fact that it is the cheapest way to cover distance) the majority of the thousands of airliners in the sky right now are right up against the coffin corner.
Re:The Celera 500L aircraft may fly soon by kenneth on Saturday June 08, 2019 @10:42PM (#20136720)
As long as you know you're stalling. Air France 447 stalled all the way from cruising to crashing into the Atlantic without anyone onboard realizing it.