Hello, I have just flown Turkish Airlines ARN Terminal and I was really impressed! Check-in in Terminal 5 was quick and efficient. Staff were courteous, and signage was easy to follow. The lounge experience was an added bonus—spotless, roomy, with excellent food choices. Boarding was on schedule, which is not always the case at busy airports. The overall atmosphere in the terminal was peaceful and professional. Turkish Airlines provided a great beginning to my journey, and I would certainly use them again from ARN. Highly recommend it to other travelers!