To change your airline, go to your Profile & settings. To do so, open the StaffTraveler app or point your browser to StaffTraveler for web. Tap or click your profile picture or menu icon in the app's top-right corner and choose Profile & settings. Scroll down to the Airline section. Here, you can change the airline you work for.
If you switch airlines, you don't need to upload a new staff ID. We only need your airline crew information once to activate your account.