Originally Posted by
Mbenz
If you have access to GPUs you can have some printed and use them day of departure. I have been about 10/10 clearing on these in recent years on LH flights. Doesn't matter if booked as LH or UA flight number in my recent experiences.
GPUs don't matter how the flight is booked as they are day-of-flight upgrades that LH deals with.
It is always a good policy to not book codeshare flight numbers and always try to stick with the operating airline flight number.