Here's a neat trick. For 12/27 to 1/3 from Expedia:

DTW-ORD-LAX on AA is $427 RT
DTW-ORD-LAX-LAS is only $347 RT
LAS-SJC-LAX is $84 RT.

Booking two full round trips may be a Saturday night stay violation, but booking an interesting DTW-LAS-LAX-DTW circle trip is certainly legal. You may have to stay 4 hours in Vegas, though, which isn't bad at all. Of course, you'll book it as:

DTW-ORD-LAX-LAS -SJC-LAX -DFW-ORD-DTW. That's eight segments, about 5500 miles. But you'll have trouble booking that on aa.com since it won't offer you flights with double-connections if enough flights with single connections are available.