“1) Extensive travel from the Wusan epicenter by thousands of travelers to NYC/North Jersey major airports. The virus spreads to the local population.”
Wrong! It spread for NYC from Europe. About 80% of those infected in NYC have the Italian strain of the virus, not the original Wuhan strain. Italians were coming to NY through mid March with no screening!
The first known NYC case was an Iranian health care worker who had been to Iran.
https://apnews.com/42dcd4edafb7ca57767a58b3e82a3375