The airport protests around the Muslim Ban are a case in point. They sprung up quickly, without much leadership. This type of protest is made to order for the left, because large international airports tend to be located near large cities. Just as Occupy started with Occupy Wall St., the airport protests seem to have started at JFK. And the largest ones are near instantly recognizable left strongholds.
I looked at a list of large international airports in the US, and there are about 30 of them. I tried to match them to a reported list of airport protests. There are three large cities -- NYC, DC, and Chicago -- that seem to have an under-protested airport because they have two large airports each and protests focussed on one of them. But otherwise, my impression is that the area with a number of large airports that isn't reliably blue enough to have large protests is Florida.
The geographic base of protests has good elements and bad. It makes it easy for horizontally organized protest to start in NYC. It makes it difficult for protest to spread to the areas of the country that most need it. It means that left-leaning areas can get a lot of media, but makes them less aware of the attitudes of people elsewhere.
But the major problem is that it represents a vulnerability. As with OWS, when a protest in NYC gets repressed, the penumbra goes away -- people outside don't have the ability to sustain a national or international movement. That's something that people have to think about.