St Louis's ability to support service to Europe is questionable at best, especially year round. The old STL
flight did fine in summer months, but winter months, even at 4x daily, did extremely poorly from what I remember. I also heard that cargo loads were a problem for that flight, so my guess is that it wasn't the strongest of flights for American.
Mexico, in my mind, is another story. It's not inconceivable to think that Mexicana may make a re-entrance at some point, but I'm not counting on it.
Couple the terrible facilities in the D concourse with the questionable support, it probably means that LH
won't come here for some time to come. Lufthansas has visited the city before, but I don't know if thats a good or a bad thing.