https://www.transfermarkt.com/-modify-cancel-delta-airlines-cancellation-policy-24-hour-help/thread/forum/696/thread_id/37582/page/1#anchor_37803
https://www.transfermarkt.com/1-833-732-2296-what-is-expedia-cancellation-policy-latest-info/thread/forum/696/thread_id/41375/page/1#anchor_41087
https://communities.actian.com/s/question/0D5Nu00000KrvsuKAB/delta-with-24-hour-delta-airlines-cancellation-policy-fly-delta
https://communities.actian.com/s/question/0D5Nu00000Ks0RDKAZ/cancellationtickets-delta-cancellation-policy-bookingdirectly
https://es.wikipedia.org/w/index.php?title=Usuario_discusi%C3%B3n%3AChristjam#Delta_Cancellation_Policy
https://support.us.edu/hc/en-us/profiles/27088286228759--Delta-with-24-hour-Delta-Airlines-cancellation-policy-Fly-Delta
