As was mentioned before, jumpseating in the form we have in North America is virtually unheard of overseas. Some carriers will let you ride in FA or Cockpit jumpseats if there are no seats left in the cabin but only if you have a zed or some kind of pass already (think of it as an extra seat they may allow you to use). Generally speaking though, this is more common in Europe as I am unaware of this happening in Asia....Good luck!