The airport database is just that, a global database of all airports worldwide.
Search by either ICAO or Name to find an airport then launch the Approach System. You can also get an up to date METAR report by selecting an airport and clicking "Get METAR".
Remember to make sure your sim is using a real world weather system before using real world METAR to make decisions and fly. You can also bring up information for an Airport, including all frequencies, elevation data and runway information.