Taxi cabs in New York are big, comfortable, clean and even have a screen where you can play whatever you like, including a GPS so that you can verify the taxi's route.
Yellow cabs in the Big Apple are never scarce. However, when it starts to rain it is practically impossible to find one that is free.
Contrary to popular opinion, taxi cabs in New York are not overly expensive. The average price of a standard journey in Manhattan is about $10. These are the general rates:
Here are some examples to get to the various airports from Manhattan. The prices include supplements, toll fees and tips. Taking a taxi cab to the airport is more expensive than moving around The City in a cab. For example, the peak hour supplement is $4.5.
In short, taxis in New York are more affordable than in other cities like San Francisco or Las Vegas.
Although it is not mandatory, normally you tip the driver between 10% and 15%, or at least round up to the closest dollar.