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The card is new so not a ton of data points yet, but in general small transactions from some airlines do trigger the credit. I believe neither Delta nor Southwest trigger the credit. But pretty much anything under the sun from American will as long as it is charged by them.
For any legitimate incidental charges from a domestic airline, you can always call BOA to have it credited. Any merchant supplying Level III transactional data to their card processor will show what is on the invoice. There are some retailers that I buy from at work that show item name and price for every item on an order when we get our credit card statement.