https://help.annke.com/hc/en-us/community/posts/38286402034585-Seat-Options%F0%9D%9F%AD-%F0%9D%9F%B4%F0%9D%9F%B1%F0%9D%9F%B1-%F0%9D%9F%B4%F0%9D%9F%AF%F0%9D%9F%B4-%F0%9D%9F%B0%F0%9D%9F%B3%F0%9D%9F%AC%F0%9D%9F%ADUpgrades-Is-it-worth-upgrading-to-economy-Plus-on-United
read more..