Hellenic Civil Aviation Authorities http://www.hcaa.gr/home/index.asp?lang=2  Hellenic Ministry of Transport & Communication http://www.yme.gr/index.php?getwhat=1&oid=531&id=&tid=%CF%83%CF%84%CE%BF  Makedonia Airport (LGTS) http://www.thessalonikiairport.gr/  Air Traffic Safety Electronic Engineers Association http://www.hcaa-eleng.gr/  AOPA http://www.aopa.gr/en/default.asp  Remove Before Flight http://www.11aviation.com/  Aviation Weather - EURO WX PROPILOTS http://www.euro.wx.propilots.net/  Aviation Weather - AVBRIEF http://www.avbrief.com/