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/how-much-does-aeromexico-charge-to-change-a-flight.pdf

https://collaboratory.gse.upenn.edu/sites/default/files/webform/how-do-i-connect-with-people-on-aeromexico.pdf

https://collaboratory.gse.upenn.edu/sites/default/files/webform/does-expedia-have-a-24-hour-customer-service-number.pdf

Ｈｏｗ　Ｄｏ　Ｉ　Ｓｐｅａｋ　Ｔｏ　Ｓｏｍｅｏｎｅ　ａｔ　ＥＸＰＥＤＩＡ®　Ｒｅｓｅｒｖａｔｉｏｎ　Ｎｕｍｂｅｒ：　Ａ　Ｆｕｌｌ　Ｇｕｉｄｅ

https://collaboratory.gse.upenn.edu/sites/default/files/webform/get-in-touch-with-expedia-customer-service.pdf

１５／Ｆｉｆｔｅｅｎ　Ｗａｙｓ　Ｔｏ　Ｓｐｅａｋ　Ｈｏｗ　Ｇｅｔ　ｉｎ　Ｔｏｕｃｈ　ａｔ　Ｅｘｐｅｄｉａ®：　Ｓｔｅｐｗｉｓｅ~Ｇｕｉｄｅ

https://www.laundromatresource.com/forums/topic/6-ways-to-talk-to-china-southern-live-support-guide-3/

https://pantip.com/topic/43606639

https://www.laundromatresource.com/forums/topic/5-ways-to-speak-to-china-southern-customer-agent-guide/