I did a search but could not find a thread on this specific subject, so thought it would be useful to others as well to know what the procedure is. (There's not much information on the UA website either.) What I do know -- at least as I understand it -- is that we are able to upgrade on a standby basis at the airport on the day of flight for LH metal flights, be they LH or UA/CO codeshare numbered LH metal flights. However, we must request and obtain a printed version of the SWU to present at the airport which of course takes a few weeks for delivery by mail. Fares are restricted, though more generous at the low end of coach than on UA metal. (All but: X, I, R, N, N, W, S, L, E on long haul international flights; L and T on intraEuropean flights.) My questions: 1. Does one notify LH in advance of the intention to use one of these upgrades? 2. Can the upgrade be requested when doing OLCI? 3. What priority do SWU holders have over LH's own elites upgrading at the airport? 4. Is the upgrade confirmed on any connecting flights once the first segment is confirmed, or is each segment processed separately at the respective airport? 5. What's been the success rate for using these things?