Private car services. Like a taxi, only prebooked. Uber uses many black car companies in NYC.
As untog says. Limos in other words. In addition to people booking them for theater or such, it's very common for downtown law firms, investment banks, etc. to have an account with a private car firm so that people working late can just call up to get one to take them home.
Black cars aren't limos. A more accurate way to describe them would be unmarked taxis that are dispatched not hailed. What us New Yorkers call a car service.
> Black cars aren't limos.
What's the difference?
Might be size (I'm not in NY).
Standard definition of a limo is an extended wheelbase and partition between the passenger and the driver. I suppose one could argue the details but that's how the distinction is understood in an NYC context at least.
They have "limo licenses" but yeah, few if any of them are actual limousines in wheelbase / shape. Most are towncars or upscale SUVs.