Originally Posted by
Ninthace
Of course you have to have an air stream going where you want to go, at a suitable altitude to maintain a covert presence and you have to know where the airstream is. How feasible is that?
The location and strength of jet streams has been remarkably accurately known since about 1980 and incredibly well forecast for substamtial periods ahead since about 2000. It is one of the nice uncomplicated aspects of Met., because no H2O enters the equations. Or, at least, it didn't back in the day.