system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do you not suffocate on an airplane during a long flight?

I know that an aircraft cabin is pressurized while at low elevation, but how is there enough air for a really long flight? Ex. Dubai to San Francisco on an A380 with over 500 passengers.
gpt
It isn't sealed air tight, far from it.

Air is constantly pumped into the cabin through the climate control system. The jet engines take some of the air that passes through their compressors (bleed air) and sent it to the plane's HVAC system for the passengers.