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rutankrd, that is another story. I'm talking through ticketing with KLM and partners. Depending on destination, it's cheaper to fly KLM via AMS than with BAW and partners through LHR.
True indeed many consolidators in particular can offer attractive fares UK-AMS- The World whilst the very same consolidators might be offering Rome- LHR - the world at rates Rome- The world can't compete on but thats exactly how the Hub and Spoke system is supported, along with the bribes offered to premium cabin customers for up front multiple of X2 X5 and up X10 of base fares for benefits such as lounge access "free sandwiches cakes and booze" oh and award/mileage/avios or what ever points redeemable at some future time at rates determined by the said carrier.
Its funny and potentially corrupt industry when analysed in detail.