I think I'm getting oriented. Thanks for the site info - we are flying American Airlines to Dallas from San Francisco and then going on with American Airlines to San Antonio an hour later. I had allowed plenty of time but we are using frequent flyer points and already they are changing flights on us. I had a look at the airport site and it looks like American Airlines flies into Terminal C (please tell me if I'm wrong) and, if we book our luggage straight through in San Francisco, it looks like we can stay in the secure zone and just walk around to the gate where we board our next flight. If I'm right then that works out to be very comfortable as long as the flights are all running on schedule and that one's out of my hands! Luckily this is the only place we have a connecting flight on the whole trip.