Originally Posted by
Sealink
Kayak lets you select the class of service for each sector. Not sure if they will return exactly the same fares, although they should.
I've been trying Kayak for a mixed cabin connecting itinerary (DUB-LHR-LAX in WT/WTP and LAX-LHR-DUB in CW/CE) and it ends up just sending you to the BA site where it only shows the higher class for the full itinerary (e.g. in this case it shows everything in CE/CW).