Turkish Airlines Miles&Smiles - Problems with booking Comfort class to Seoul/ICN

I am trying to book AMS-IST-ICN for mid july with a return a month later and the timetable on the tk website shows that they fly the B777W with comfort class to ICN on wednesday and saturday but when i try to book it i get an error.Does anyone why this is , are they fully booked or is it just a glitch in the system or maybe they are not actually flying the B777?Any info would be welcome.

Depends on which dates you are looking at. When I searched some random dates in July (outbound the week of July 8, inbound the week of July 25) some days showed up with the 340 operating IST-ICN. Perhaps they are in the process of updating their schedule with some aircraft substitutions.

I am trying to book AMS-IST-ICN for mid july with a return a month later and the timetable on the tk website shows that they fly the B777W with comfort class to ICN on wednesday and saturday but when i try to book it i get an error.Does anyone why this is , are they fully booked or is it just a glitch in the system or maybe they are not actually flying the B777?Any info would be welcome.

Unfortunately both system glitches (the TK website booking engine being the culprit) and a/c substitutions are common occurrence with TK. If I were you I would call up the AMS office (the TK Call Centre can be quite busy) to find out about availability for Comfort on your desired dates. Good luck!

See: http://www.turkishairlines.com/en-tr/contact_us/offices.aspx