Frontier resuming PHL service to RDU service 3x weekly. I'm sure more expansion is coming soon.
Over on the Frontier Airlines Network Thread, a poster mentioned that PHL became a pilot base as of 1/1/2019 and that the airline is ramping up staffing at the airport which likely indicates further expansion at PHL by F9.
I would expect this will include the return of some routes operated previously by F9 at PHL, but perhaps some new destinations as well. Some of the routes I could see them trying from PHL include DTW, IND, CMH, CLE, MSP, and SDF. Perhaps they will try a route not currently served nonstop from PHL by another carrier such as TUL, ICT, LIT or ABQ. One thing I appreciate about F9 is that when they’ve launched new nonstop flights to unserved destinations from PHL in the past, AA has responded several times by launching the same route. Examples that come to mind are MSN, OMA, DSM and SRQ, as none of these were operated by AA nonstop from PHL until F9 announced these routes.
Additionally, I’d also like to see F9 increase the number of destinations with daily (7x weekly) service from PHL. Currently, I believe MCO, RSW, TPA, DEN & SJU are flown daily.