Same areas will be able to snuff it out with luck, social distancing and contact tracing. Stopping flights prevent them from being reinfected. But quarantining incoming travelers might achieve the same thing with fewer drawbacks.
Quarantining incoming travelers from high-risk destinations will likely help, but will NOT achieve the same thing. COVID-19 is already here and circulating in the community. It has been for weeks. We just aren't testing for it (this will change in days or maybe a week, so wait for the big explosion in cases). Two weeks ago, there was capacity to administer and process 700 tests. Not 700 per day. 700 total. It has improved a little since then. But it is only now that actual significant testing capacity is being brought on board. Something S. Korea has had for about a month. We are way way behind.
If by community you mean the US as a whole, yes. But there are many areas and smaller cities in which it has not arrived. Those could be helped. And if a smaller city is infected and then gets clean, they could be helped too. That's what I was referring to. Stopping domestic flights.
