Looked back through this thread and found this video. Folks these aren't balloons, it's nonsense to even conjecture such an explanation. You can see there are very precise and controlled movements: Quite beyond any possible known means to control a balloons, especially at altitude where wind is much more likely to be encountered. Especially in New York with it's massed buildings and man made heat sinks causing all kinds of convention currents off these structures.
If there is an explainable part, which I'm skeptical about forwarding in the first place, then it's that these spherical ball like objects could be free~air projected plasma balls. Similar to the form created in microwaves as seen on youtube, but done in the atmosphere, which it's known that under a DARPA program free air plasma balls have been created and sustained for a few minutes.
However, though these do look like they could be similar, they also are staying there for quite a long time and do appear much more solid. I think these are drones, as in antigravity drones, but as to who's they are is questionable. I think you're looking at a slow indoctrination to the idea that you're rulers, the self appointed ones, are cluing you in on your new slave overseer's enforcers. They do somewhat resemble the flying death balls in the movie "Oblivion don't they?"