Not surprising... we know DL's attitude and they'd love to force all pax to only be able to search for and book through their own crappy website and remove every shred of information and transparency about the fare basis, rules and pricing.

Its also pretty clear that a move like this shows that DL doesn't give two craps about the casual leisure traveler, which is the category that most of those other booking sites draw. Its lower fare/revenue which DL is against and feels they don't need to fill planes. If they think they can fill everything up with high paying business pax then fine I guess its good for them. Personally I'm hoping for some backlash to maybe put a shred of humility back in DL's corporate attitude and actions.