I have not switched my frequent flyer program to Singapore Airlines because I enjoy using Precheck + the United app.
If I buy a United flight online and credit to Singapore Airlines program, can I still check-in with the app, use pre-check etc.?
Notably Singapore Airlines is not a member of Precheck, and I log into my United app with my United frequent flyer number. If I bought a United ticket without that United number, I worry I may lose Precheck access.