Turkish Airlines is awful. They closed the boarding gate twenty minutes before the departure time. I could not get to the gate before, because the airport was crowded, despite I have runned fast. The employees saw me, as they saw, too, an Asian family of four and a Turkish lady, who strongly knocked on the glass door, but they ignored us. They knew I was at the airport, as I did the check-in on time, but they did not mind. I think they were overbooked and so the last to arrive stays on the ground (in other airports we can hear them calling for passengers on the speakers, but not this one!). Then they did not care for me. They took advantage of the fact that I do not speak their language to ignore me (but they helped – and was the right thing to do - the turkish lady). They were very rude. They said they had nothing to do with me, was not their problem, they could do nothing since I missed the plane, so I had to buy another ticket (on information desk asked 800 Euros for a ticket!!). So I was left at the airport without any help, and I had to buy a ticket for the next day (which was more expensive than the initial two-way ticket). Later I complained to support service, but they continue to say that it's my fault that I did not arrive in time at the boarding gate. But it's a lie! They closed the door in my face, before the time!
Therefore if you use this airline, get ready, because they have no mercy.
And by the way, the service is nothing special ... The food sucks; and they gave me half a glass of wine and when I asked for more, they ignored.
I see now Turkish Airlines has thousands of complains in the Internet. They do not care for the passengers rights.
They reply the complains, with nice and beautiful words, while actually “stab us in the back” ... and with a smile

IF YOU CAN, USE ANOTHER AIRLINE