https://intercom.help/infanthelp/en/articles/11637142-how-to-include-a-lap-infant-on-your-frontier-airlines-ticket

http://acfl.net/forums/topic/maneras-de-contactar-con-el-servicio-al-cliente-de-copa-airlines-por-telefono/

https://intercom.help/infanthelp/en/articles/11637138-frontier-airlines-add-infant-step-by-step-for-parents-easy-guide

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https://intercom.help/infanthelp/en/articles/11637136-how-to-add-infant-to-frontier-with-screenshots-support-deep

https://www.obscuregamers.com/threads/15-ways-to-contact-how-can-i-speak-to-someone-at-southwest-airlines-%E2%80%93-the-complete-guide.16758/

https://acfl.net/forums/topic/contactar-con-atencion-al-cliente-de-delta-airlines-a-traves-desd-e-espanol/

https://pantip.com/topic/43575589

https://erherhrhs.zohodesk.com/portal/en/kb/articles/c%C3%B3mo-llamar-a-delta-airlines-desde-estados-unidos-vuelo-o-hacer-una-reservaci%C3%B3n

https://acfl.net/forums/topic/twenty-ways-to-speakhow-can-i-call-to-someone-at-united-airlines/