United States
https://central.xero.com/s/question/0D58V00009SIAPESA5/%F0%9D%93%94%F0%9D%94%81%F0%9D%93%B9%F0%9D%93%AE%F0%9D%93%AD%F0%9D%93%B2%F0%9D%93%AAdial-how-do-i-upgrade-my-seat-i
https://central.xero.com/s/question/0D58V00009SHnjASAT/-how-do-i-upgrade-my-seat-on-american-%F0%9D%94%B8%F0%9D%95%9A%F0%9D%95%A3%F0%9D%95%9D%F0%9D%95%9A%F0%9D%95%9F%F0%9D%95%96%F0%9D%95%A4-