Even once it starts up, the data which answers the question will be a trade secret. The planes may be full or relatively empty, but what matters is what people are paying, e.g., PRASM.

New routes also have their ups and downs. There are people used to flying/traveling to NYC, who will fly non-stop from Boston and people inbetween who would have headed to NYC who will now trek into Boston. Changing consumer buying habits takes time.