Due to the lack of a DEN-BOS route on F9, I will be going for Airtran Airways (FL), via ATL, when I visit BOS in August.
The timing is very bad, as I will have a 4.5-hour layover in LAX before my FL flight departs at 10:00pm for ATL, another 4.5 hours away. Then, it's another 1.5-hour layover before I board my 2.5-hour flight for BOS.
If F9 served BOS, I would gladly choose the 8:45pm flight out of LAX, land in DEN the same evening and sleep the rest of the night way on DEN-BOS!
Loony