Originally Posted by
ama66
..1. Can I use UA miles to upgrade to Business? How many miles would that require and what's the procedure?
You can if booked in the coach classes Y or B (or in the Biz classes C or D) on an LH operated flight under LH flight number
iff upgrade inventory is available.
That means absolutely no code share tickets!
Details
here.
Upgrade cost is 30K miles per direction.
B fares are filthily expensive and Ys even more so. It might be wiser to buy the cheapest upgradable fare on LH (that would be V) and then use printed Systemwide Upgrade certificates to process the ug.
You can use the lounges if you travel in Biz, not as a Premier.