May 18, 2001
Source: United Airlines
http://www.united.com/site/primaryPR/0,10026,1528_806,00.html
On May 18, 2001, United Airlines issued a press release reporting on recent changes to its uniform guidelines. "United’s customer service employees at the carrier’s hubs across the United States are allowed to wear a company-sanctioned hijab, turban or yarmulke as part of their uniform."