Dear MM forum I am about to book the following trip, but need advice about the Business Saver upgrade on LX. CPH-ZRH-MAD on 100% Swiss metal, but ticketed by LH. Can this be upgraded to Business Saver after I have purchased it on lufthansa.com? I know the trip can be upgraded during booking if I book on Swiss.com, but unfortunately Swiss.com does not let me select the return trip on LH that I need. Only lufthansa.com will let me book the route I wish which is a combo of LX, LH and SK. Thanks in advance!