With a flight tracking website, you can view up-to-date flight schedules, including delays and weather. You can also check where you (or a friend) are on the plane in real time. Some flight trackers can even help you find parking deals to help you avoid parking delays.
How to Easily Track Flights and Share Flight Info on iPhone, iPad, and Mac!
We use these to track someone else's flight, or just to check air traffic in the area, or to keep an eye on the traffic at a specific airport.
FlightAware is one of the best online flight trackers because of its detailed information.
Of course, you can find a specific flight based on the flight number, but you can also perform a general search based on the departure and arrival airports. This is useful if you want to see all flights departing to those locations or if you don't know the flight number.