Frontiers of Flight By George W. Gray Books / Hardcover Transportation › Spaceflight Publisher: Alfred Knopf, January 1948 Price $17.99 Free Shipping Send to a friend Collectible - Very Good First Edition With Dust Jacket First edition copy. Collectible - Very Good. Good dust jacket. (United States, Aeronautics) $17.99 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.