<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by glide:
Can I use those four segments at the end of the trip, i.e. ex MAD to South America, then use those four segments when I return to Europe at the end of the year, before I return to Madrid?</font>
Yes you can use 4 segments but you can only stop twice. For example you could route:-
XXX-LHR-CDG (stopover in CDG) 1 segment
CDG-LHR-HEL (stopover in HEL) 2 segments
HEL-MAD (end) 1 segment
You will have used all 4 segments.