When they are allowed to go?
Alitalia was on their way alredy yesterday, but got called back to Rome. So obviously there is great confusion.
Security has little with airline or airline nationality to do. Security is an AIRPORT issue mainly. And mainly DEPARTURE airport.
It is natural that in this situation there are several law enforcement structures within the USA who are not totally aware who are responcible for what. It will take some days to get responcibility lines sorted out and get new rules implemented globally. There will probably be a lot of "stop-go-stop" incidents over the next week or two. Take it easy, or stay at home. Until October. My $.02.
Rgds, Preben Norholm
Always keep your number of landings equal to your number of take-offs