I think the SAL route is very new. And I think I know what the problem is. It's not daily service. It operates Monday, Weds, Fri, Sat. So if you look for a flight on Tues, Thurs, or Sun from DFW-SAL, all you will see are MIA connections. For a nonstop, you need to choose one of the applicable days.
This is one of those things where a travel agency is actually useful. They usually aren't, but if you are looking for a flight on the intenet, and were looking for, let's say, a Tuesday, you'd think the flight no longer exists. A travel agent on a Sabre set would see the XTQS which tells them except Tuesday, Thurs, Sun.
Oh well, I digress. Have they already bought their ticket? If not, maybe they can still fly nonstop.
Only three AA route cuts have been loaded so far. None of them from DFW. I don't think many routes will be cut. They'll just be thinned a little (meaning rather than 6 daily flights to somewhere, you'll see 4 or 5). The revised schedule will be out in a week or two. Cutting an uneconomical route has a financial benefit. Cutting a marginal route doesn't have the economic benefit that trimming it does. It squeezes it for higher margins if you just trim it a little!
Matt