https://www.bmwfaq.org/threads/four-smart-ways-to-connect-with-a-real-person-at-delta-airlines.1070900/
https://www.bmwfaq.org/threads/how-to-instantly-reach-a-live-agent-at-frontier-airlines.1070955/
https://forums.flyer.co.uk/viewtopic.php?f=1&t=137966
https://forums.flyer.co.uk/viewtopic.php?f=1&t=137873
https://www.stylevore.com/how-to-easily-reach-a-human-at-frontier-airlines-using-multiple-contact-methods/