Biz platinum with AA primary airline
had used up $175 and then got another $200 by calling earlier in the year. Purchased $100 GC, got reimbursed and the breakdown says $25 airline credit and $75 special offer AA/US.
So if you got $100 for AA/US, and buy 3 $100 Gc, it will 1st use up your airline fee credit of $200 and then whatever you got....