This is quite a good article and I believe it deserves more than GA class. It has a defined structure and lots of images. It also covers the topic completely--Phoenix 15 (Talk) 11:31, 21 October 2007 (UTC)
Everything looks good in this article. Its meets all the GA and FA criteria. In my opinion, go for FAC.Mitch32contribs 12:16, 21 October 2007 (UTC)
You might want to fix the PDF file links to citations (see WP:CITE for more details). Also fix Hot air airship made by Gefa-Flug redlink. Miranda 12:20, 21 October 2007 (UTC)