Wife came across this, and thought it might amuse me. It did.
It is a young people's book, published in 1912 by the same people who carried on the 'Wizard of Oz' sequels. I expect boys up to their early teens before the war may well have read the this.
Here is the cover, and the color illustrations in it:
As you can see, the boys, and a young miss, seem to have gotten pretty far in the world....
I have not read through it, but here is a link to an on-line copy of the thing....
https://archive.org/details/Flightbrothers00Hend
