Haunted Airways

What a beautiful cover. This book doesn't seem to be all that rare, or all that difficult to find — this copy seems to be from 1935 (though the book was originally published a few years earlier).

As an added bonus, for some reason this copy had seven One Dollar Silver Certificates hidden inside, most from 1957 (one was from 1935), a few of which look as though they had been minted only yesterday.