American Airlines (AAL) has come under fire from one of the most influential civil rights organizations in the U.S.

The National Association for the Advancement of Colored People (NAACP) has issued a statement warning African Americans about their safety when traveling on American Airlines flights.

Shares of the Fort Worth-based airline were falling in pre-market trading on Wednesday.

"The NAACP for several months now has been monitoring a pattern of disturbing incidents reported by African-American passengers, specific to American Airlines. In light of these confrontations, we have today taken the action of issuing national advisory alerting travelers-especially African Americans-to exercise caution, in that booking and boarding flights on American Airlines could subject them disrespectful, discriminatory or unsafe conditions."

The travel advisory is in effect starting today Wednesday, October 24 and will last until further notice.

The advocacy group contends that a " series of recent incidents involve troublesome conduct" by the airline implies a "corporate culture of racial insensitivity and possible racial bias."

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