https://support.zendesk.com/hc/en-us/community/posts/7559402531098--DELTA-1-716-791-9668-How-Do-I-Cancel-My-Flight-At-Delta-Airlines-CoMPlete-GuiDe
https://support.zendesk.com/hc/en-us/community/posts/7559358422938--DELTA-A-1-716-791-9668-How-To-Cancel-Flight-At-Delta-Airlines-EaSy-ProcESs
https://support.zendesk.com/hc/en-us/community/posts/7559395787802--CAll-DELTA-Everything-You-Need-to-Know-About-Delta-s-Cancellation-policy-IN-ALL-DETAIL
https://support.zendesk.com/hc/en-us/community/posts/7559