A supporter of the Black Lives Matter movement claims she was booted from an American Airlines aircraft and banned from flying with the commercial airline for “flying while Black.”

Imani Cezanne posted the accusations on Twitter early Monday as she detailed the Mar. 26 incident. Cezanne claimed she was escorted off the plane because a flight attendant felt threatened by the Black Lives Matter shirt she was wearing.

In a statement, American Airlines said that “an unruly passenger was removed from American Eagle Flight 5192, operated by PSA Airlines, from CLT to ATL due to failure to comply with crew member instructions. The passenger refused to exit aircraft when asked, so local law enforcement was called.”

The airline has plans to “work with the customer to resolve the issue.” The company also said it “values diversity and we do not discriminate for any reason.”

Read more at JETMag.com.