I found out while on a plane that had just left Hawaii headed for Sydney. I couldn't understand why the flight attendants were walking around with manifests, then talking at length with select passengers. Turns out they had identified those traveling through NYC and wanted to ID those with family there. In the airport 10 hours later saw what I thought were incredibly bad-taste tabloid newspapers headlines. Add in jet lag and it was probably 2 days before I understood what had happened.