Was just going to book today
Day 1: FRA-SFO (LH in F)
Day 4: SFO-RNO with UA (F)
Day 5: RNO-DEN with UA (E and E+ only)
Day 5: DEN-FRA (LH in C with upgrade request)
but my TA really couldn't book a E+ seat for me (*G, LH HON) on RNO-DEN. She called UA and was told, that is no longer possible.

So my new itinerary is as follows:
Day 1: FRA-SFO (LH in F)
Day 4: OAK-RNO (South West)
Day 5: RNO-ORD (AA in F)
Day 5: ORD-FRA (LH in C with upgrade request)

No UA anymore...