There are 21 Waco YKS-7 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 1937 and 1940.
N29370
1940 Waco YKS-7
Weirsdale, FL
N19386
1939 Waco YKS-7
Williamsburg, VA
N19371
1938 Waco YKS-7
Alliance, OH
N19373
1938 Waco YKS-7
Union Grove, WI
N2896D
1938 Waco YKS-7
Port Townsend, WA
N17453
1937 Waco YKS-7
Woodbury, MN
N17462
1937 Waco YKS-7
Hillsboro, OR
N17466
1937 Waco YKS-7
Alliance, OH
N17471
1937 Waco YKS-7
Bremerton, WA
N17472
1937 Waco YKS-7
Signal Hill, CA
N17473
1937 Waco YKS-7
North Conway, NH
N17474
1937 Waco YKS-7
Belleville, IL
N17713
1937 Waco YKS-7
San Diego, CA
N17716
1937 Waco YKS-7
Poplar Grove, IL
N17734
1937 Waco YKS-7
Wolfeboro, NH
N17736
1937 Waco YKS-7
Cairo, NE
N17737
1937 Waco YKS-7
Cheboygan, MI
N1937
1937 Waco YKS-7
Baldwin Park, CA
N65201
1937 Waco YKS-7
Palo Alto, CA
N17464
Waco YKS-7
Gibsonville, NC
N2629
Waco YKS-7
Kirkland, WA