| https://collaboratory.gse.upenn.edu/sites/default/files/webform/how-much-does-aeromexico-charge-to-change-a-flight.pdf |
| https://collaboratory.gse.upenn.edu/sites/default/files/webform/how-do-i-cancel-my-aeromexico-flight.pdf |
| https://collaboratory.gse.upenn.edu/sites/default/files/webform/does-aeromexico-give-refunds.pdf |
| https://collaboratory.gse.upenn.edu/sites/default/files/webform/does-southwest-have-a-live-chat.pdf |
| https://collaboratory.gse.upenn.edu/sites/default/files/webform/how-do-i-contact-southwest-customer-service-24-7.pdf |
