You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

A Shuttle America flight attendant 'will no longer serve United customers' following an investigation into a Muslim chaplain's complaint of discriminatory treatment during a flight, an airline spokesman said Wednesday. In an email to The Associated Press, United spokesman Charles Hobart said the airline 'does not tolerate behavior that is discriminatory — or that appears to be discriminatory — against our customers or employees.' The statement came five days after Northwestern University chaplain Tahera Ahmad said a flight attendant declined her request for an unopened can of Diet Coke because it could be used as a weapon. The flight was operated by Shuttle America for United.Tahera Ahmad published a Facebook post May 29 detailing her experience on a flight that day from Chicago to Washington, D.C.The flight was operated by Shuttle America for UnitedAhmad's post said a flight attendant gave another passenger an unopened beer can but told her that people weren't allowed to have unopened cansThe flight attendant said unopened cans could be used as weapons, according to AhmadAhmad has claimed she asked other passengers if they saw what happened, and one man swore at herA Shuttle America flight attendant 'will no longer serve United customers' following an investigation, a United spokesman said 
 Question:'While _ did not operate the flight, Ms. Ahmad was our customer and we apologize to her for what occurred on the flight,' Hobart said.
Output:
United