Interesting, because in 2022 they CANCELLED some of these same PHL routes! I presmumed it was because there wasn't enough "friends and family" travel to these mostly non-touristy destinations and they couldn't fill the flights.

Frontier seems to have a new strategy of flying shorter routes. Like no more Vegas flights from Philly. I assume they feel they can't charge enough to pay for the fuel on the longer flights.I'm guessing these flights are part of that strategy.

In any event, it's an almost certain bet most of these routes will soon fail, so fly them while you can. Nobody has ever had any luck competing against AA at PHL, and it seems like just about every airline has tried. Oddly, Frontier is trying again even though they have already failed.