Weather
http://www.dwd.de/
http://euro.wx.propilots.net/
http://www.donnerwetter.de/
http://weather.noaa.gov/weather/DE_cc.html
http://www.met-office.gov.uk
Airports
http://www.eddh.de/
http://www.airports.de
http://www.egelsbach-airport.com
Aircraft
http://www.cessna.com
http://www.newpiper.com
http://www.cirrusdesign.com
http://www.socata.com
Administrations
http://www.jaa.nl
http://www.faa.gov
Publications
http://www.pilotweb.co.uk
http://www.flyer.co.uk