https://pressbooks.pub/bookpress/chapter/what-is-the-penalty-for-cancelling-a-flight-on-american-airlines/
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https://pressbooks.pub/bookpress/chapter/what-is-the-penalty-for-cancelling-a-flight-on-american-airlines/
https://pressbooks.pub/bookpress/chapter/what-is-the-penalty-for-cancelling-a-flight-on-american-airlines/