Congrats ASA guys! Mesaba's an alright place now, due to the massive growth, but I'm not going to touch "Mesaba vs. ASA" now that the nightmare over there is finally (is it too good to be true?) coming to an end. We just ended our nightmare over here, so I know how it feels.
You have to look at bases and overall career path to make up your mind now. It's no longer a case of "we're relatively happy, and they aren't".
I don't know what's in your TA, but I'm pretty sure your MEC wouldn't waste your time or hopes on anything less than decent.
Congrats, again.