Found this, don't know if it is still current or the categories are correct.

ATL - 88, 737, 75/767, 7ER, 764, 777 (for now)
CVG - 88, 737, 7ER going away
DTW - DC9, 320, 330, 757, 744, 777
MEM- DC9, 320
NYC - 88, 737, 7ER (767), 764, 777
MSP - DC9, 88, 320, 330, 757
SLC - 88, 320, 737, 767
LAX- 737, 7ER
SEA - 330

QTY Category
136 B757/B767
129 A320
116 MD88
88 B717
83 B737
79 B767ER
65 MD90
55 B737ER
37 A330
18 B777
9 B747

Is this about right?

Thank you everyone.