Delta doesn't have enough 175s to cover their 70/76-seat scope. That's it.

9E is primarily DTW, MSP, and ATL right now because Delta can put 900s on poorer routes. Some of the places that we fly are just happy that they have two-class jet service. Someone heading from Fort Wayne to Atlanta isn't going to ***** about seat 1A in a 900; someone flying from LaGuardia to Buffalo might. The cabin is tighter. The plane is louder. The windows aren't very big. Gate-checked luggage sucks.

9E is clearly in second place to any 175 provider when it comes to any route that Delta can make a **** ton of money on.