It is a good store....
As mls515 stated, American does indeed utilize gates on L, H, K, and G. They are:
L1, L2, L4, L6, L8
K1, K2, K3, K4, K5, K7, K9, K11, K13, K15, K17, K19, K18K16, K14, K12, K10, K8, K6A, K6B
H9, H11A, H11B, H13, H15, H17, H18, H16, H14, H12, H10, H8, H6, H5, H4, H3, H2, H1
G1, G3, G10, G8, G6, G4
Now please note that I am only talking about American above. American Eagle is located on the G concourse as well and will use some of the above mentioned G gates at times plus:
G3, G5, G7, G9, G11, G13, G15, G17, G19, G21, G20, G18, G16, G14, G12
American's use of the G concourse is preferable only after 14:00 and use of the L concourse is not desired unless it is really needed which usually happens around the evening crunch time. Mostly L is used for Apple Charters and the like with the exception of Love Field on L1.
Additionally, IB will be located at K19. The AA 777s tend to hover around K12 nd K16 (with one at L8) and the other wide body international departures mostly depart K5, K7, K9 and K15 on average.