A Playboy model says she got dress-coded on a recent American Airlines flight ... and, she thinks her hair color and the size of her chest are major reasons why.

Sara Blake Cheek spoke to us about a recent experience flying with the company ... she says she made it through security, scanned her boarding pass and got all the way to the plane, when she claims a flight attendant told her to button her flannel and cover her sports bra. X / @saracheeky1

Sara shared photos of her outfit to social media after she says this all went down ... and, we gotta say it's not super risqué ... certainly more coverage than a swimsuit would provide. Plus, given what's allegedly gone down on some flights recently, showing a little cleavage ain't such a big deal.

Cheek was shocked and totally humili

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