Flight was on time, got everyone boarded, ready to go, when the pilot decided there was a problem. Everyone had to deboard taking everything with them. 2 hours later we reboarded. This time we took off 2 hours 15 minutes late.
On arrival in St. Louis they let us off at the last gate of concourse C, C28, so they could work on the problem some more.
Made everyone wonder how we even got to St. Louis if the problem was not fixed before we left Dallas.