11.  United spokeswoman Whitney Staley, however, disagrees.

12.  United spokeswoman Chris Nardella said attendants should make their safety concerns known to the company.

13.  United spokeswoman Susan Leyva said the baggage templates have been popular among customers because they streamline the boarding process and afford more storage room on their planes.

14.  United spokeswoman Susana Leyva cautioned that the process is not yet completed.

15.  Among the new measures, United will require several identification documents for freight and small package deliveries, said Connie Huff, a United spokeswoman.

16.  United Airlines spokeswoman Judy Bygrave refused to comment on whether all three incidents involved the same plane.