How much does it cost to fly a horse from Turkey to California?

I live in Athens, Greece with my holsteiner gelding who is 11 years old he has an international passport and is healthy. I am not able to pay alot of money to ship him if it costs over than 10,000 euros than i will not be able to take him with me to america and will have to sell him. I would like to know how much it would cost to fly him over to the U.S and if I am able to use Turkish Airlines to fly him over there. Also please explain to how i contact the airlines and if it is safe and nice to the horse. Please answer my question it is urget and i have to move by the end of the month.