Like… for what?

Marketing.

737s are barely bigger than this and not jumbo jets, they are narrow bodies.

737s are also kind of funny to pick since they are kind of notoriously small (this was one of the causes for the max crashes, Boeing needed to lengthen the nose gear and move the engines significantly higher on the wing in order to fit them, a normal 737NG with CFM56 engines, the bottom of the engine is about 2 feet off the ground only).

CRJs are smaller, but they are still commercial jets that fit tons of people.