Cranky Flier has a long and extremely positive article about Frontier at TTN today:

http://crankyflier.com/2013/01/08/fr...-more-flights/

"Let’s be honest. There’s nothing special about Trenton itself other than the fact that it has a well-located airport that’s cheap to use. In fact, Frontier doesn’t even call the airport Trenton – it calls it Princeton/Trenton and has it show up under both Newark area and Philadelphia area airports on its website.

That is the magic of Trenton. The airport lies right off I-95 near a wealthy population center in southern New Jersey. It’s also only 35 miles from Philadelphia and 55 miles from Newark. It’s relatively close to a train station served by Amtrak, New Jersey Transit, and SEPTA. (According to the airport, it’s a $12 cab ride.) So the location is highly accessible".

He ends with:

"This is about getting friends and family back and forth to visit each other. Or its about the college kid going to visit Philly on a very tight budget. These are people who might drive today because the cost and time involved with a flight from Newark or Philly is prohibitive. It’s not about taking traffic from the other airports but rather it’s about stimulating new traffic in the ultra-price sensitive category.

Considering the expansion we’ve seen so far, it sounds like people are responding to the new service. I would imagine we’re going to see this get a lot bigger. Not every route will work, but Frontier has tapped into a real opportunity here."

I think he's right - not every new route will work, but there's only one way to find out and Frontier is working from the solid base of the Florida routes.