Airliner Zoo
The Wall Street Journal notes that a combined Delta - Northwest would have airliners from ten different families.
Wouldn't that be:
Boeing: DC-9/MD-8x, 737, 747, 757, 767, 777, 787 (on order)
Airbus: 320 family, 330
Bombardier: CRJ
Maybe Embraer: ERJ for an 11th family