Certainly, doing some basic things like building bathrooms post-security and installing at least a post-security vending machine would be a good idea regardless. But my comment was based on two things:

1. The history of commercial service at TTN. Over the past 20 years, most service at TTN has been on small aircraft and frequently of short duration. The Frontier service is an outlier and as such I wonder at the advisability of spending big money on capital improvements. Yes, I realize it's a bit of a chicken-egg thing, but previous attempts at starting service at TTN should be a stark warning.

2. The long-term viability of Frontier Airlines itself. True, waiting 6 months might not shed any light on that situation, but given the airline's ever-changing route map, its struggle to find a niche that works, and the cutthroat competition at its DEN hub, I have to wonder whether Frontier will be flying anywhere, much less TTN, a year from now. (I know, that's a topic for a separate thread.)

Anyhow, I don't think the problem at COS was inadequate facilities. At any rate, COS has bathrooms and a food court post-security. The problem there seemed to be that Frontier grossly over-estimated the demand for non-stop service from COS. I highly suspect they'll find the same is true in TTN, especially with a major international hub a 30-minute train ride away in EWR.