Originally Posted by
angatol
Eligible flights are BA coded, BA metal, IB coded+IB metal. So LHR-MAD-BCN-LHR would get 3 elibigle flights for instance.
Idea #1: You could even add a vertex to get all 4 eligible flights.
e.g.
LHR-BCN on BA
BCN-MAD on IB
MAD-MUC* on IB
MUC*-LHR on BA
* Substitute MUC for anywhere that IB serves from MAD and BA serves from LON (FRA or {insert long list of European capitals here} ...)
NB: in you were thinking purely in terms of price, such a trip may be a poor strategy. Better to book two returns, one nested in the other:
e.g. LHR-BCN-LHR
with a nested BCN-MAD-BCN
Idea #2: don't forget Domestics count so e.g. MAN-LGW-JER-LGW-MAN would get you your four flights on BA metal all in one booking.