I have made the flight from Dushanbe to Kuhrog. The approach in down a very narrow valley with no room for mistakes or bad weather. I rode a Yak 40 (read OLD) and doubt if the fleet has been upgraded.
Flights will not take off is there is even a hint of wind, rain, storms or any other climatic event. We stayed in Dushanbe 3 extra days just waiting for the weather to clear, and if you plan to fly from Khurog to Dushanbe the same wait is required. I ran out of money in Khurog and had to make arrangements with the Aga Kahn Foundation to front me some money for my room until I could reach Dushanbe. Fortunately I knew the AKF director in Dushanbe.
That ride is not for the faint of heart, but er well stimulating, and a darn good cure for constipation.