Conversation so far:
How many aircraft did Glenn Curtiss's factory produce during World War 1?
Curtiss created the JN-4 "Jenny" for the Army, and the N-9 seaplane version for the Navy.
How many employees did his company employ in Buffalo during World War 1?
18,000 workers in Buffalo.
What year was the Curtiss NC designed?
In 1917.

Question: Where are the four NC flying boats located today?
Self-contained rewrite: Where are the four NC flying boats by Glenn Curtiss located today?