S19 may refer to:
== Aircraft == Letov Š-19, a Czechoslovak airliner Rans S-19 Venterra, an American light sport aircraft Short S.19 Singapore III, a British flying boat SIAI S.19, an Italian racing flying boat Sikorsky S-19, an experimental Russian biplane
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).