https://cris.unu.edu/sites/cris.unu.edu/files/webform/39-ways-to-call-to-live-agent-at-virgin-atlantic-airlines-a-step-by-step-guide.pdf
https://www.wikitree.com/wiki/Space:21_Ways_To_Talk_To_Live_Agent_At_United%E2%84%A2%EF%B8%8F_Airlines_USA%E2%84%A2:_A_Step-by-Step_Guide