It does, but it's hidden at the bottom of the FAQ [1] page. I agree with the other comments about how they could do a better job of surfacing this kind of information.
> We fly the beautiful Bombardier CRJ Series and Embraer ERJ Series. These are regional planes with 50 to 100 passenger seats. These planes are the same planes that are used by United Express, Delta Connection, and American Airlines.
> We fly the beautiful Bombardier CRJ Series and Embraer ERJ Series. These are regional planes with 50 to 100 passenger seats. These planes are the same planes that are used by United Express, Delta Connection, and American Airlines.
[1] - https://www.jumpdriveair.com/faq-1