Hi,
just booking my trip in the US, a bit different to my earlier itinerary! I have the UK-US par of the trips now (change of dates meant I had to accept a direct, rather than stop over return flight).
Now looking at US portion.
Successfully booked LGA-MIA-LAS
Now Looking at LAS-LAX, there is a flight via PHX, they are AA flight codes, but confused a little by the British Airways AVIOS Calculator: which appears to be the wrong way round? Is this correct or is there a gremlin in the system?

Economy lowest (B, G, N, O, Q) 625 20

Economy low (K, M, L, V, S) 375 10

Economy flexible (Y, H) 625 20