https://supportcommunity.milestonesys.com/s/question/0D5bH00000ZGvkvSAD/8558384701seatupgradepolicy-can-you-upgrade-seats-through-expedia-changeseat?language=en_UShttps://supportcommunity.milestonesys.com/s/question/0D5bH00000ZGvkvSAD/8558384701seatupgradepolicy-can-you-upgrade-seats-through-expedia-changeseat?language=en_UShttps://supportcommunity.milestonesys.com/s/question/0D5bH00000ZGvkvSAD/8558384701seatupgradepolicy-can-you-upgrade-seats-through-expedia-changeseat?language=en_UShttps://supportcommunity.milestonesys.com/s/question/0D5bH00000ZGvkvSAD/8558384701seatupgradepolicy-can-you-upgrade-seats-through-expedia-changeseat?language=en_US