The only issue with BOS and I think for both TTN and ILG, is that JetBlue provides good competition at both the PHL and EWR airports up to BOS.
I agree on MYR, which would be relatively easy given the short distance. However, F9 would have to open a station there, which is not a big deal. I'd like to see F9 open MYR with TTN and ILG, CLE, MDW, and eventually PIT. I think TTN-PIT and/or ILG-PIT also needs to be opened up. I'd think something like TTN-PIT-MKE (thru flight) would be more reliable to fill loads and profitable than TTN-MKE, but that's just my guess.