Originally Posted by
OldiesONfoldies
Pack it in a cardboard box, protected with white foam boards and bubble wrap. It shd do the trick, most times.
One caution on that. We have had the airline make us sign that there were only responsible for loss, but not damage of stuff in cardboard boxes. They then put stickers on the boxes expressing that. It that case the boxes contained our camping gear, panniers, and clothing for our tour, but it may be something to consider when flying with a folding bike as well.