Seeing as how you are in Warwick, TF Green would indeed make the most logical choice. If SW does not pan out (price-wise) you could always consider JetBlue out of Logan. With Song merging back into mainline Delta, I would heed the previous advice of being cautious with Delta. I don't suspect that Delta will drop this route from Boston but they have been playing with the times too much for my comfort. Booking far in advance on either JetBlue or SW will get you the best rate.