- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-air-france-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-british-airways-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-qatar-airways-customer-service-usa-contact-numbers-step-by-step-guide_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-jetblue-airlines-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-alaska-airlines-customer-service-usa-contact-numbers-step-by-step-guide_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-delta-airlines-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-united-airlines-customer-service-usa-contact-numbers-step-by-step-guide_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-southwest-airlines-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-american-airlines-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/complete-list-air-canada-customer-service-usa-contact-numbers-step-by-step-guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/_%20%20Singapore%C2%AE%20AirlinesHelpline%20Numbers%20%E2%80%93%20Direct%20Access%20to%20Customer%20Care.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/_American%20Airlines%C2%AEUSA%20Helpline%20Numbers%20%E2%80%93%20Direct%20Access%20to%20Customer%20Care.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/Air%E2%84%A2Canada%C2%AECustomer%20Service%E2%84%A2%20Contact%20Numbers%C2%AE%20%E2%80%93A%20Step%20by%20Step%20Guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/air-france-helpline-numbers-direct-access-to-customer-care_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/Alaska%E2%84%A2Airlines%C2%AECustomer%20Service%E2%84%A2%20Contact%20Numbers%C2%AE%20%E2%80%93A%20Step%20by%20Step%20Guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/alaska-airlines-helpline-numbers-direct-access-to-customer-care_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/coinbase%C2%AEcustomer%20service%20contact%20numbers%E2%80%93a%20step%20by%20step%20guide.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/British%C2%AEAirways%C2%AECustomer%20Service%E2%84%A2%20Contact%20Numbers%C2%AE%20%E2%80%93A%20Step%20by%20Step%20Guide_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/Delta%E2%84%A2Airlines%C2%AECustomer%20Service%E2%84%A2%20Contact%20Numbers%C2%AE%20%E2%80%93A%20Step%20by%20Step%20Guide_0.pdf
- https://ppf.ucsf.edu/sites/ppf.ucsf.edu/files/webform/Full-Directory-of-Air%20Canada%C2%AEUSA%20Customer%20Service%20Numbers.pdf