Spirit Airways sells the massive Entrance Seat onboard its plane, which is analogous for the seats in US domestic first class, but there is no other variance in support or facilities for patrons seated in that area. Sadly, scheduling these stunning suites to and with the U.S. is practically impossible: https://businessflightshop.co.uk/blog/buy-cheap-business-class-flights-from-uk-to-costa-rica-for-a-healing-holiday/