I'm looking at ID90 to travel to FRA next month.

The only airline it loads is BA through LHR. I know there's more than one ID90 company out there, how does one access space available Lufthansa travel? (I live in L.A., Lufthansa is non-stop)

Also, the MyUA Discount tool is a pretty expensive Lufthansa ticket, for confirmed seats, there's not a cheaper way to get your hands on a ticket, is there?

Thanks a bunch, I don't travel outside of work much and am pretty ignorant about this stuff.