Depends on the airline.
Athe the kiosk or download it to your pass wallet iOS/Android
You can download it from your airlines website if you check in online. Or print your boarding pass off at any kiosk in the airport when you check in there. Or you can check in with an airline attendant at the airport. (Probably 1.5 to 2 hours before your flight)
At your airline kiosk or your airline's website or app.
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