There are 3 Viking Flying Boat KITTY HAWK B-4 aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1929 and 1931.
N753Y
1931 Viking Flying Boat Co KITTY HAWK B-4
Plymouth, MA
N293M
1929 Viking Flying Boat Co KITTY HAWK B-4
Plymouth, MA
N34V
1929 Viking Flying Boat Co KITTY HAWK B-4
Keller, TX