The Rulebook
100

where does the most flying happen(which atmosphere)

The Troposphere 

200

This gas in the air is what pilots and passengers need to breathe to stay conscious

Oxygen

300

At very high altitudes, the air gets "thinner," which means there is less of this pressing down

Air pressure

400

This special layer in the Stratosphere protects commercial pilots and passengers from the sun's harmful UV rays

Ozone Layer

500

These fast "rivers of air" high in the sky can help a pilot reach their destination much faster

Jet stream

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