Originally Posted by flyerhacker

Nice work! I did a very similar thing, so sharing my experience as well (in similar format to yours as it was easy to follow).

12/13: Changed my airline to Delta through Amex
12/13: Purchased $50 Delta gift card through Delta site (used different card to keep clean)
12/14 (make sure at least 24 hours after gift card purchase): Purchased main cabin flight $248.40 through Delta site using $50 gift card and remaining $198.40 on Amex Plat
12/16: Transaction of $198.40 posted (if you click on transaction on a desktop, you can see it described as "Additional Collection")
12/17: Through Amex Benefits, saw that $198.40 of my $200 credit had been used, though credit did not show on statement yet
12/18: Amex credit of $198.40 shows on statement
12/19: Plan to cancel flight in exchange for eCredit in amount of $248.40

Thanks all for the help!