Just a frame? Use standard shipping method like international version of UPS or Fedex. Much easier than a whole bike. Bikeflights is for transporting fully assembled bikes in ready-to-ride condition. Not for shipping frames or parts or even whole bikes that will need assembly upon arrival. Think about it: European manufacturers shipping to the US don't use Bikeflights. You don't need a specialized service for that. Just pack it well. Heavy double-walled box.