The FAA does not regulate seat pitch. The norm is 31 to 33 inches. I suspect both Silver and Intercaribbean are running 28 or 29. It’s doable for 1 hour. Beyond that it’s agony. My company once booked me on a 2 hour flight in Europe on a low cost carrier. Probably a 29” pitch. I am 5’9” and it was agony.