Tonight I was booking my flight for a fishing trip. The itinerary was from my home town to Houston to Istanbul to the final European destination.
The initial flight and the last flight on the return would be code-share with United. Booking it all through Turkish Air was $325 more than booking the United flight separably with United. I've had this happen in the past so I pick the trips apart and check rates independently. For $150 I would book through Turkish Air for the security of one ticket, but for $325 I will just take an earlier flight with for peace of mind.
The Turkish Air website also had some flight times on their own flights wrong on their website. My last leg there are two flights a day, one in the early morning and one in the evening. The two flight numbers were shown, but the departure time for both was shown at the earlier flight time. Not too reassuring.