| https://www.goodreads.com/topic/show/23172249-what-is-the-cancellation-policy-of-frontier-airlines |
| https://cris.unu.edu/sites/cris.unu.edu/files/webform/%40M%C3%A9xico%20Tel%C3%A9fono%20American%20Airlines%20%C2%BFC%C3%B3mo%20puedo%20llamar%20a%20American%20Airlines%20en%20M%C3%A9xico_.pdf |
| https://cris.unu.edu/sites/cris.unu.edu/files/webform/How%20do%20I%20change%20my%20name%20on%20American_%20AmeRican%20A%20CHAnGe%20POLiCy.pdf |
| https://cris.unu.edu/sites/cris.unu.edu/files/webform/Spirit%20Airlines%20Cancellation%20and%20Refund%20Guide.pdf |
