Spirit Airways sells the Big Entrance Seat onboard its plane, which is analogous for the seats in US domestic first class, but there's no other difference in support or amenities for customers seated in that area. Unfortunately, scheduling these stunning suites to and within the U.S. is almost not possible: https://businessflightshop.co.uk/blog/what-are-the-best-south-asian-destinations-you-can-travel/