https://pressbooks.pub/ushistory1name/chapter/everything-you-need-to-know-about-changing-your-delta-airlines-flight-date/
https://pressbooks.pub/ushistory1name/chapter/quick-guidence-how-to-change-the-date-on-your-american-airlines-flight-ticket/
https://pressbooks.pub/ushistory1name/chapter/step-by-step-guide-changing-the-date-of-your-united-airlines-first-class-ticket/
https://pressbooks.pub/ushistory1name/chapter/quick-tips-for-changing-your-delta-airlines-ticket-date/
https://pressbooks.pub/ushistory1name/chapter/faq-correcting-the-date-on-your-united-airlines-flight-ticket/