Many OW FF programmes give zero or reduced miles for L class flown on most other OW carriers. But what is there to prevent someone from using several programmes (say QF and CX and AA) and selecting the programme to which they want to credit each segment of a LONE, so as to get 100% miles for each segment? Is this allowed, and can the computers cope with it? (Yes, you would need to do many LONEs to get a decent reward in each programme.)