Bought a flight about two weeks ago with gift card + Platinum card, and $200 airline credit posted about two days later. Then bought a $100 egift card a week later thinking that would put me over the $300 requirement for Amex Offer. Didn't get the usual Amex Offer email and as of now (another week later) I haven't seen any additional credit. Did I mess something up, or am I being impatient (or both)?