Yes, looks like some kind of new fare file/misfile. EF is having problems finding cheapest AA fares so I think there were probably issues with latest file. Usually on routes with heavy WN non-stop presence, the other carriers will match WN cheapest fares with BE fares. DL, UA, B6, and AS all have $45 BE fares as cheapest fares on LAS-LAX matching WN's cheapest WGA fares. Their cheapest main cabin fares are all $75. I'd expect AA to fix/correct filings relatively quickly.