https://pressbooks.pub/customersupport/chapter/call-%e2%98%8e%ef%b8%8f-1888-417-5699how-to-book-a-group-flight-on-lufthansa-airlines-step-by-step-guide/
https://pressbooks.pub/customersupport/chapter/call-%e2%98%8e%ef%b8%8f-1888-417-5699how-to-book-a-group-flight-on-lufthansa-airlines-step-by-step-guide/