The AA BE fare is basically a match of WN's $139 ($147 with connection) WGA fares. However, having a hub on one end (and a former hub on the other), AA knows it can extract a large differential from it's regular frequent flyers when upfaring to main cabin. You can find more extreme examples when AA sometimes matches ULCC fares with BE from it's hubs. DL also matches WN's WGA fares on this route with it's BE fares, but the differential is DL's standard $35 each way as these aren't captive markets for DL. I've yet to see a differential larger than $35 each way for DL on domestic routes (other than oddball corner cases with broken fares). But then DL does not generally match the ULCC fares. There are a few cases where it is less than $35 on DL out of competitive markets like SEA and BOS when DL is going against AS and B6 routes (AS often has a smaller differential and B6 has yet to introduce BE fares).