https://collaboratory.gse.upenn.edu/sites/default/files/webform/american-airlines-customer-service-usa-direct-contact-numbers-detail-guide-in-2025.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/all-nippon-airways-customer-service-usa-direct-contact-numbers-detail-guide-in-2025.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/alaska-airlines-customer-service-usa-direct-contact-numbers-detail-guide-in-2025.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/air-canada-customer-service-usa-direct-contact-numbers-detail-guide-in-2025.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/westjet-airlines-customer-service-usa-direct-contact-numbers-detail-guide-in-2025.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/Full-List-Of-Singapore-Airlines-Customer-Service-24-7-Live-Person-Support-Numbers-A-Complete-G-Uide%20%281%29.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/Full-List-Of-Alaska%20-Airlines-Customer-Service-24-7-Live-Person-Support-Numbers-A-Complete-G-Uide.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/Full-List-Of-Copa-Airlines-Customer-Service-24-7-Live-Person-Support-Numbers-A-Complete-G-Uide%20%281%29.pdf