| https://www.goodreads.com/quotes/13465689-para-comunicarte-con-frontier-desde-puerto-rico-puedes-llamar-al |
| https://sites.google.com/view/official-pr/home |
| https://apps.dmr.ms.gov/sites/default/files/2025-08/%7BIberia%20Puerto%7D%20%C2%BFC%C3%B3mo%20puedo%20llamar%20a%20Iberia%20desde%20Puerto%20Rico_~%28SJU%29.pdf |
| https://www.cucei.udg.mx/maestrias/biotecnologia/sites/default/files/webform/frontier_espanol_como_puedo_comunicarme_con_frontier_en_espanol_.pdf |
| https://puertorico.zohodesk.com/portal/en/kb/articles/iberia-atenci%C3%B3n-cliente-c%C3%B3mo-llamar-a-iberia-desde-puerto-rico |
