Все варианты расписаны на сайте:
https://www.turkishairlines.com/en-us/a ... with-pets/Если у вас сложно с поиском, вот текст:
If your pet does not weigh more than 8 kg with its cage and the cage dimensions do not exceed 23 cm high, 30 cm wide and 40 cm long, we can transport your pet in the cabin of the aircraft. We transport your pets in the cabin section in hard-case cages or specially produced soft-case cages/bags. The cages/bags must have ventilation holes with a diameter of 2.5 cm on a minimum of three sides for adequate air circulation. It should be noted that the lids/zippers of live animal cages and bags must be kept closed throughout the flight.
The cage must be hard-case for pets over the specified weights and dimensions to travel safely in the aircraft hold. Please note that other than the plastic carriers, we can also carry your pets in specially produced hard- or soft-side bags (soft cases).
For cat breeds (Birman, Exotic, Persian, Himalayan, Burmese, Scottish Fold and British Shorthair etc.) and dog breeds (Affenpischer, Pekinese, Pug (All breeds), Shar Pei, Shih Tzu, Japanese Chin, Lhasa Apso, Tibetan Spaniel, Chow Chow, English Toy Spaniel, English Bulldog,
French Bulldog, Boston Terrier, Boxer, Brussels Griffon and Bull Mastiff (English Mastiff, etc.)
if they are not suitable for transportation in the cabin, we can carry them in the cargo section of our aircraft, provided that the reservation and boarding procedures are done through Turkish Cargo.