United States
https://www.ielsm.com/forum/discusiones-generales/what-day-of-the-week-are-united-flights-cheapest
https://www.entmasterclass.com/forum/general-discussion/does-american-allow-name-changes-on-tickets
https://www.entmasterclass.com/forum/general-discussion/fast-accurate-air-canada-refund-policy-24-7
https://www.entmasterclass.com/forum/general-discussion/66-739-0640-does-singapore-airlines-allow-name-changes-on-tickets-1