Https://www.optumhealtheducation.com/sites/default/files/webform/direct-help-how-do-i%20check-in-online-for-united-airlines_0.pdf https://www.optumhealtheducation.com/sites/default/files/webform/direct-help-how-do-i%20check-in-online-for-united-airlines_0.pdf