https://central.xero.com/s/question/0D58V00009ORbPESA1/can-i-upgrade-a-ticket-i-bought-on-expe%F0%9D%95%95%F0%9D%95%9Aa-upgradeseat
https://supportcommunity.milestonesys.com/s/question/0D5bH00000ZG2TQSA1/seatupgradecan-you-upgrade-seats-through-expedia-completepolicyguide?language=en_US