Is there luggage storage at the airports for a few days? thanks

Don't think so, there are no more lockers at the airport, safety hazzard.

Airlines also won't hold them for you, and they could get lost that way too.

I saw lockers in the terminal at St. Louis last Feb. However, I did not check the time span they could be used. There used to be lockers in Amtrak station in Seattle but they told me they were for a max of 24hr.
I travel solo a lot and luggage storage is a problem. In Alaska a Best Western, Anchorage, had a locked room(large closet) where you could leave your locked luggage while you went on other excursions. They did log it in and out and gave a claim check. Only place I found that would do that. If you hear of any other solutions put it out on the forum...

There is a facility at Hartsfeld in Atlanta....a for fee deal for around $6 a day per bag, I think. So I was hoping for same in NYC.....

Look at the Travel Tips Forum -- I posted a website that gives you info on quite a few airports worldwide.