if you are going to clear customs and collect luggage and walk to domestic terminal then im sure 50 mins wouldnt be enough, however if you can check your luggage through from your connecting flight and go into transit and clear customs and immegration at CNX then it is sufficient. If you have lounge access the TG lounge in the transit/international area is alot better than the lounge in domestic. When you flight is called they take u by bus direct from the international terminal to the plane