Hopefully this is a straightforward question.
I can see some Swiss flights in my Lufthansa app, likely because I added them by PNR. Can I use the LH app to check in for a Swiss flight, or do I need to get the Swiss app? The Swiss flight is the first part of a UA ticket if it matters.
Thanks.
The apps are all interchangeable and you can use an LH-issued BP on your LX flight with no problem.