Spirit Airways sells the Big Entrance Seat onboard its aircraft, which has similarities for the seats in US domestic first class, but there is no other big difference in support or amenities for patrons seated in that part. Our agency does a great deal of business with overseas buyers. 我們公司與海外客戶的生意往來很多。 https://www.businessflightshop.co.uk/first-class-flights-to-houston-usa