There are other routes out of TTN like that: 1x daily on MWF. I'd doubt it removes the service before starting it. If it doesn't perform, it's just becomes "seasonal."

Frontier sent an email out to pax that have used TTN, promoting this new service today as a new Florida city for $49. I'd bet majority have never heard of St.Augustine, FL.

I have friends that have rented a car in one city, done Orlando-Tampa-Miami in a week or 10 days in Florida, so I suppose originating in Northern Florida can be possible. It's a 2-5 hour drive from there down to western and So. Florida.

Jacksonville likely also isn't as hot as other parts of Florida in the peak summer months, as Frontier is launching this in the summer, which is typically when Southwest and Spirit downsize on Florida service from PHL and ACY.

I wonder how Frontier will promote this service from the JAX side though. Likely limited service to Trenton isn't going to do much to capture pax from there, but maybe it adds more destinations from that market and advertises in the Jacksonville area (via newspaper, TV, etc.)