When booking 1-4 weeks in advance UA is more competitive. I’m looking at LAX-MCO vv in June and UA is astronomical (as is DL in C+). I wouldn’t normally book this early but I have no flexibility, which the airlines are counting on. Ended up booking MCO-LAX on B6 this week. Three seats + Even More Space upgrades was several hundred dollars cheaper than UA (and we get E+ for free). I’m waiting to see what happens with pricing on the outbound. Fingers crossed it drops on UA or DL.