Https://urop.gatech.edu/sites/default/files/webform/thesis_approval_form_upload/_sid_/42-c-mo-contactar-a-un-humano-en-delta-por-tel-fono-chat-o-correo-electr-nico-gu-a-de-ayuda-completa.pdf https://urop.gatech.edu/sites/default/files/webform/thesis_approval_form_upload/_sid_/42-c-mo-contactar-a-un-humano-en-delta-por-tel-fono-chat-o-correo-electr-nico-gu-a-de-ayuda-completa.pdf