I can't imagine there's really much demand for Harlingen. Except for one week a year when they ferry some drunken college kids to South Padre.

Having lived in Phoenix for a while, I also think Tucson is pretty superfluous. Lubbock and Amarillo also seem like pretty lame destinations.

Mind you, I'm sure that every one of these cities have plenty of flyers who consider the service very important. I'm just talking about "useless" destinations in the sense that neither business nor leisure travelers who do not live in the city are likely to use it.