GB: Jackson has NINE trips a day and it pulls its weight. Plus, if the ugly planes ever get in to the Hotlanta suburbs...it is sitting there like a juicy plum. Jackson, for whatever reason...looks EAST. Sort of like El Paso looks WEST. Southwest offered a bunch of cheap nonstops from ELP to DAL in the late 70s...but it took a long time before more folks flew from ELP to DAL..HOU...AUS than flew to El Lay.
Those "rinky dink" cities in Texas that folks think would never have service....Midland, Lubbock, Corpus Christi....they have 15, 15, and 9 flights a day (respectively) and arguably would still get service if Southwest was starting up today. The yields are REAL good on those.....esp between CRP-HOU, LBB-DAL, & MAF-DAL...that is all business traffic for the most part, despite the notion that businessmen won't fly on Southwest.
Southwest did not desert Denver because of its hub status for UA, FL, or CO. Rather, it had to do with there was no gate or counter space, it had to be acquired from Ozark....Ozark's folks worked the flights, they lacked the same sense of urgency that Southwest's folks did....and between that, congestion at Stapleton, weather delays...at the time it just wasn't worth the hassle.
so I guess the "worst city" was BPT, which was a shame. The folks in the "Golden Traingle" were real glad to have Southwest. Jefferson County Airport was a sound facility. Back in the 50s....it was probably the nonstop flight from DAL to BPT on TTA's DC-3s that saved that company to later turn in to Continental. But times change...and BPT was never able to produce the loads necessary on 5 trips a day 737s.