Allow me to bow down to the wealth of knowledge on this board and ask what I hope are the only two questions I'd like to answer before finalising my itinerary for a DONE4 ex CAI.

Firstly, what is the definition of a stopover? For example, it would be nice if I could fit in a daytrip to a European city whilst on my stopover between Cairo and the US, but I assume that the first stopover will therefore be after the CAI-LHR leg, and the second stopover after the, say, CDG-LHR lef. Therefore the final leg of my trip should be a straight-through booking via LON eg. SIN-LHR-CAI. No time for another stopover in Europe. Does that make sense? IS that right?

Secondly, one line in the fare rules states that 'travel on any codeshare service operated by AA/AY/BA/CX/EI/IB/LA/LP/QF is permitted'. I'm not clear whether this means that I can travel on any codeshare operated within this group e.g. BA on QF metal, or any codeshare that operates under one of these designators, e.g. QF on Alaska Airlines. I imagine it's the former, although would be good if it's the latter.

Thanks in advance for the advice!