The Federal Aviation Authority lots of airport-related information. AirlineAndAirportLinks.com posts lists of airports by cities, regions and codes with links to each airport's Web site.
To find out when a flight will take off from or land at an airport, you can either (a) call the airport, (b) call their airline or (c) use the free "Flight Tracker" on TheTrip.com.
To you look up an airport by name, city or airport code, use the Airport & City Code Converter. You'll get the current weather conditions, current delays, airport maps, etc. (http://codes.managementreporting.com).