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- https://starlinkforum.net/topic/16130-%C2%BFc%C3%B3mo-llamar-a-delta-airlines-en-m%C3%A9xico-delta-airlines-tel%C3%A9fono/
- https://starlinkforum.net/topic/16130-%C2%BFc%C3%B3mo-llamar-a-delta-airlines-en-m%C3%A9xico-delta-airlines-tel%C3%A9fono/
- https://starlinkforum.net/topic/16130-%C2%BFc%C3%B3mo-llamar-a-delta-airlines-en-m%C3%A9xico-delta-airlines-tel%C3%A9fono/
- https://crm.ridemetro.org/forums/general-discussion/618aeecd-77bf-ef11-b542-001dd80082b2
- https://crm.ridemetro.org/forums/general-discussion/fa0089f2-77bf-ef11-b542-001dd80082b2
- https://www.devex.com/people/how-late-can-you-change-a-lufthansa-flight-airlines_helpdesk-2237023
- https://www.devex.com/people/what-is-the-24-hour-rule-for-lufthansa-help-me-2236792
