That's the God's honest truth. It's hard to imagine climbing into something so new and unknown as an early airplane. Think about it... When WW1 started, aviation was only about a decade old.
An amazing period of history, to say the least.
It truly was. I remember a letter to
Flying magazine many years ago, in which the author said something like this:
"I keep reading these accounts of World War I pilots flying at 15,000 feet, sometimes 20,000 feet, trying to take photos or shoot down the planes taking the photos. We have to go on oxygen at 10,000 feet [hey, I told you it was an old issue of the magazine]. Were these guys lying or did they have leather lungs?"
The answer posted by the magazine was, "They must have had leather lungs."
- oldman