I barely understand how wifi works to begin with, but how do they get it to work (and connect to the internet properly) on an airplane?
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Wifi is the local distribution, just like the wifi at home is just for your house.
At home you would have something like google fiber or at&t internet (dsl/cable/fiber) and that would be connected to a modem/router that provides wifi in your home
The main connection to the internet on planes is via satellite, viasat and iridium are 2 providers for aviation internet for example.
They also have a wifi router in the plane to share the connection with passengers (and for the plane/pilots itself ofc)
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