The president of Northwestern University has called on United Airlines to formally apologize to the school's Muslim chaplain, whose claim of discrimination on a flight from Chicago has sparked a social media campaign and boycott.

In a letter to United CEO Jeff Smisek, University President Morton Schapiro said he was disappointed at the "outrageous and discriminatory treatment" of Tahera Ahmad, an associate chaplain and the director of interfaith engagement at Northwestern.

Ahmad was flying from Chicago to Washington, D.C., last week on a United flight operated by Shuttle America when a flight attendant brought her an opened can of Diet Coke. Ahmad documented the encounter and its aftermath on Facebook.

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