The pro-Trump motto—which originated when a reporter misheard chants of “Fuck Joe Biden” at a NASCAR event last September— was emblazoned on a sticker that was photographed by a Twitter user ahead of her flight on Saturday.

The woman then sent it to American Airlines and asked if they accepted such “cowardly rhetoric on their crew luggage when they’re in uniform.” The airline responded publicly: “Thank you for bringing this to our attention and we want to get this to the right team.”

Then, in a direct message conversation, American Airlines told the woman: “We take this very seriously and have sent this over to crew leadership... They will handle this internally after review. We assure you appropriate internal review will occur.” American Airlines has not responded to requests for comment as of Monday morning.