In the clouds
Above the clouds
The flight levels
Airliner altitude
Above the airliners
Edge of space
A perfect climb
Top of the Burj Khalifa
One mile up, as high as Denver
250-knot speed limit below here
Pilots start to need oxygen
Skydivers jump from about here
A Cessna 172's ceiling
Top of Denali
Contrails start forming
Top of Mount Everest
Where most airliners cruise
Highest bird ever recorded
A Boeing 737 can't go higher
A Gulfstream G650's ceiling
Tallest thunderstorm tops
Concorde cruised here at Mach 2
Water boils at body temperature
U-2 spy planes fly up here
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