Originally Posted by
FBplatinum
#1 - I will agree with you if it say:
a) Diamond Medallion Members will be eligible to use Global Upgrade Certificates to upgrade from economy to Delta Premium Select OR Delta one,
b) On Delta Premium Select-equipped aircraft, Global Upgrade Certificates can still be used to upgrade from economy to Delta One.
#2 - You must admit the "words" use by Delta is not clear (or can be more clear).
https://www.delta.com/content/www/en...tificates.html
at the bottom, click to open the section "GLOBAL UPGRADE CERTIFICATES REDEMPTION ON DELTA"
Certificates are flexible — they can be used to upgrade directly from Main Cabin to either Delta Comfort+, First Class, Delta Premium Select or Delta One. Or they can be used to upgrade from Delta Comfort+ to either First Class, Delta Premium Select or Delta One. Or they can be used to upgrade from Delta Premium Select to Delta One.