It started with a Facebook post, led to a trending hashtag on Twitter and then made international headlines.

The fracas over the way a flight attendant insulted Northwestern University chaplain Tahera Ahmad because she was wearing a traditional Muslim headscarf culminated Wednesday with an apology from United Airlines and the company's promise that the attendant for Shuttle America will not work on United express flights until she has undergone more training.

"While United did not operate the flight, Ms. Ahmad was our customer and we apologize to her for what occurred," United spokesman Charles Hobart said in a statement. "United does not tolerate behavior that is discriminatory — or that appears to be discriminatory — against our customers or employees."

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