United States
https://central.xero.com/s/question/0D58V00009OQDTpSAP/upgare-can-i-upgrade-to-business-class-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
https://central.xero.com/s/question/0D58V00009OQCWQSA5/18558384701-can-i-upgrade-to-business-class-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
https://central.xero.com/s/question/0D58V00009OQ9TMSA1/upgear-can-you-upgrade-to-business-class-on-%F0%9D%95%8C%F0%9D%95%9F%F0%9D%95%9A%F0%9D%95%A5%F0%9D%95%96%F0%9D%95%95-%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