https://airtravelguide.odoo.com/blog/sothwest-airlines-11/ways-to-call-singapore-airlines-customer-service-directly-by-phone-number-email-or-chat-a-full-support-guide-12 https://airtravelguide.odoo.com/blog/united-air-12/ways-to-call-united-airlines-customer-service-directly-by-phone-email-or-chat-a-full-support-guide-13