To ticket:
Construct a multicity itinerary on BA US website
DFW-ORD
ORD-LAX
LAX-MAA
MAA-LAX
LAX-ORD
ORD-DFW
This prices for me on BA US website at $3182.50 with the following segments
25 Apr BA1966/BA4348/BA0282/BA0035
27 Apr BA0036/BA0269/BA4363/BA4437