Regarding our 717s and delays....there was a 717 on our gate (A-5) with a mechanical delay. We had to circle around to the even side of the A gates in alley #1, to gate A-2 for a new gate. The 717 did get off the gate, but about :20 mins late. No idea what the delay was about. I'm sure the mechanics will get the a/c squared away, and reliable. Wasn't that way in this case, yet.