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It's not clear to me from the article that Love Field is primarily responsible for the shortfall. Executive Airport was recently expanded, which must have either cost money out of pocket or an increased debt load. And what exactly does "a transition to new business" mean? Is Executive being sold or something?
That said, the landing fees at Love Field seem too low and should be raised a bit, if possible. There's no reason for Dallas to subsidize Southwest or Continental, two airlines that actually make money now and again.