We were 5 people (3 different reservations) traveling from EU to Japan for a ski vacation. Our first flight got canceled due to technical issues with the airplane and we could not get another flight to reach the transfer from Istanbul to Tokyo. We had to get a new flight that delayed our arrival date by 1 day. The worst thing is that they didn't rescheduled our domestic flight from Tokyo to Sapporo.

We went to the check-in for our flight to Sapporo and the staff told us that our flight was actually yesterday... Not wanting to waste another minute with Turkish Airlines support I opened my laptop and got us a new flight and luckily there was a flight in 2 hours.

As our flight was flying off from EU we were covered by the EU rights and all of us got full compensation for the delay - 600 Euro (420 at the end as we used 3rd party to handle it).

Now I'm trying to get full reimbursement for the flight from Tokyo to Sapporo as I payed for it out of pocket. They are arguing that each of us should have an individual invoice and we should have not bought group tickets. For this reason I would highly recommend to use 3rd party (they take between 25-30% commission) just not to deal with airline BS.