https://www.goodreads.com/quotes/15181216-what-is-the-cheapest-day-to-book-qatar-airways-flights

https://www.seattleaa.org/wp-content/uploads/ninja-forms/11/full-lists-official-qatar-airways-support-contact-usa.pdf

https://www.seattleaa.org/wp-content/uploads/ninja-forms/11/full-lists-official-british-airways-support-contact-usa.pdf

https://www.seattleaa.org/wp-content/uploads/ninja-forms/11/full-lists-official-spirit-airlines-support-contact-usa.pdf

https://www.goodreads.com/quotes/15179545-is-it-free-to-change-flights-on-american-airlines-walk-you

https://www.goodreads.com/quotes/15179492-get-a-clear-answer-how-much-will-it-cost-to-change

https://www.goodreads.com/quotes/15179436-how-much-does-aeromexico-charge-for-a-flight-change-accurate

https://www.goodreads.com/quotes/15179403-can-i-cancel-my-finn-air-flight-ticket-and-explain-yes

https://www.goodreads.com/quotes/15179361-what-is-the-24-hour-cancellation-rule-for-klm-between-meetings-klm

https://forum.newro.com.br/index.php?/topic/26791-full-list-of-%E2%89%8B%E3%80%90canadian-north%E3%80%91%C2%AE%EF%B8%8F%E2%84%A2-customer-service%E2%84%97-hotlines-quick-access-to-human-support-complete-guide/