https://www.scienceforums.com/topic/97241-4-ways-to-speak-to-someone-at-frontier-airlines-phone-email-and-chat-the-essential-guide/

https://www.scienceforums.com/topic/97272-breakneck12-ways-to-get-through-to-a-live-agent-at-united-%E2%80%93-phone-email-chat-guide/

https://www.scienceforums.com/topic/97227-9-ways-to-get-live-human-on-frontier-airlines-phone-email-and-chat-a-detailed-airlines-guide/

Travel

https://www.goodreads.com/quotes/13079548-if-you-need-to-escalate-an-issue-with-lufthansa-1-87

https://sites.google.com/view/puedo-llamar-a-spirit-airline/home

https://www.scienceforums.com/topic/97223-a-ways-to-talk-to-a-live-person-at-frontier-airlines-phone-email-and-chat-the-complete-guide/

https://sites.google.com/view/spirit-telefono-mexico-/home

https://www.scienceforums.com/topic/97270-fleet05-ways-to-talk-to-a-united-agent-via-phone-email-or-chat-%E2%80%93-instant-help-guide/

https://mforum.cari.com.my/forum.php?mod=viewthread&tid=5455870