Originally Posted by Smooth at FL450

But this speaks directly to the point that adding a 2nd fleet type does not give SWA any fleet protection. It simply doubles the exposure to a crippling issue like this P&W engine issue. Fleet diversification doesn't show up until you have 5-6 fleet types, according to AW. An issue that grounds half your fleet is just as crippling whether it's 1 or 2 AC types.