| https://officialairlineservicedeskkcom.zohodesk.com/portal/en/kb/articles/1-866-838-4934-how-to-online-check-in-with-united-airlines-2-9-2025-2 |
| https://officialairlineservicedeskkcom.zohodesk.com/portal/en/kb/articles/1-866-838-4934-how-to-online-check-in-with-united-airlines-2-9-2025-1 |
