Attached is an excerpt from the "Scientific American War Book", concerning the anecdotes of an American volunteer pilot serving with the French air arm in 1914-5. Of interest as it describes the deployment of the darts, and markings put on some German copies - "Invented in France, but made in Germany".
There's been some debate about the veracity of such markings in a thread in Tip-offs (which has now disappeared), but the wording appeared to be in French (something like "design franšais - fabrication allemande") to add insult to injury, perhaps? Like many interesting things, fakes probably outnumber genuine surviving examples, but it would be good if any member has a known original dart with markings to show.
Here's my humble collection of fliegerpfeil. Having picked up and handled quite a few of these over the years I'm reasonably convinced the top 4 are real. The shortest one has the marking on it referred to above - I'm not convinced this one is real though. Also attached are a few close ups of the markings on the other darts.
If anyone has any genuine ones they would like to sell please let me know.