A Muslim passenger is accusing United Airlines of discrimination after she was told she could not have an unopened can of soda because it could be used as a weapon. Tahera Ahmad, who wears a headscarf, was on board a flight to Washington, D.C., when she asked for an unopened Diet Coke. Although another passenger was given an unopened beverage, Ahmad was told she could not have one because it was a security risk. United says it has apologized.