$7.50 is a US transportation tax.

XT (extra taxes) is used when you have too many taxes to list them. The XT taxes are usually breaked down in the stored fare and ticket image. Like: XT $5.00CN $21.50YTH, etc the multiple taxes then add up to the XT amount. I don't see the XT tax breakdown in your post.

Bag fees are ancillary fees, and would not be included in your ticket, ever. Unless you have a ticket designator (negotiated fare) next to the fare basis that indicates the bags are included in a negotiated fare. The only airline I know does this is AA though, with their "Choice" fares.