Top 10 Types of Planes that Southwest Airlines Should Have

I've never flown Southwest but they only have 737-300s, 500s, 700s, and 800s. They need more types of planes than just 737s.
The Top Ten
1 Bombardier CRJ-900
2 Embraer 175
3 Boeing 737-900
4 Boeing 757-200
5 Boeing 767-300
6 Boeing 717
7 Airbus a320neo
8 Airbus a330neo
9 Boeing 777x
10 Boeing 737 Max 9
The Contenders
11 Boeing 747-400
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