Travelers may want to tighten their seatbelt when flying on these routes. Turbulence is never fun, but that's especially true for some extra bumpy routes across Asia.The most turbulent flight on the continent was from China's Xining Caojiabao Airport (XNN) to the Yinchuan Hedong International Airport (INC), according to a new report from turbulence tracking service Turbli. The short route—just one hour and five minutes—had a turbulence Eddy Diss…