There are 4 Waco YKC-S 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 1934 and 1935.
N14620
1935 Waco YKC-S
Kankakee, IL
N15232
1935 Waco YKC-S
Webster, MN
N14066
1934 Waco YKC-S
Anchorage, AK
N14614
Waco YKC-S
Windsor Locks, CT