Can/will FlightAware.com tell me who an aircraft is registered to?
We display the registered owner (and city/state) under the flight or tail number on every flight page.
Not to mention the pop-up label that appears when one points a mouse curser on the flight/tail number on an Airport Activity page.
If you want more info, you can always plug the tail number into google. (It’s the fastest way to hit the FAA page on the particular aircraft you are interested instead of going to the FAA website and then searching by N number (google is faster)