I flew airtran for the first time 3 weeks ago. We left out of Memphis to MBJ with a connection over ATL.
I have to say they impressed me. Every flight left the gate early and arrived at destination early.

Was on an american airlines connecting flight last week, every departure and arrival was late, along with
them taking 35 min in DFW to get the jetway to the aircraft. Seems to be the norm for them.