Flightaware.com provides you with live flight tracking of commercial and private aircrafts. You can also use Flightaware to see a live schedule of aircrafts landing in Maine by using the following airport codes:
Airliners.net is one of the most comprehensive resources for airfcraft news, information and discussions. The site also features thousands of photographs of planes taken by photographers all over the world.
Flightradar24 is a flight tracking tool that allows you to see the location and destination of thousands of aircrafts in real-time. Check out the map below from flightradar24.com that shows you planes currently flying over New England. Click on one of the planes to find out more about the actual aircrafts flying overhead!