Lufthansa online does not give the option of FRA - SIN on SQ, which is what I want and what both Google Flights and ITA Matrix give me. Lufthansa offers only LH, and the total cost os €2845 for "Business Restricted" Neither does LX, which only gives LH and LX options. I am afraid that, if I call the airline, that is what I am going to get. May be my only choice, though as CheapoAir and edreams do not have stellar reputations (thanks FT!!)