https://www.experts-exchange.com/questions/29290700/Six-Ways-To-Access-How-Can-I-Speak-To-Someone-At-Singapore-Airlines-A-Step-by-step-Best-Guide.html
https://ctl.gatech.edu/sites/default/files/webform/teaching_with_technology_partner/_sid_/six-ways-to-access-priceline-customer-service-by-phone-number-chat-and-email.pdf