Airliners.net
Biggest aviation site in the world! Over 200,000 visitors daily!
http://www.airliners.net/

Fighter planes and military aircraft
Fighter planes, military aircraft, warbirds, jets (1930-2006) with pictures and information. Also 3D VRML models of jets to download, a FAQ explaining stealth, and aviation links.
http://www.fighter-planes.com/

www.Avitop.Com - Aviation Top 100 & Extensive F-16 info
Avitop.com Aviation Super Site: Aviation Top 100, Buy & Sell Aircraft, N-numbers Search & 8000+ links, f-16 Fighter Pictures + Much more
http://www.avitop.com/

Wright Brothers Aeroplane Company and Museum of Pioneer Aviation
An online museum of the Wright brothers, including a biography of Wilbur and Orville Wright, the history of the invention of the airplane and early aviation,and information on antique aircraft replicas and reproductions.
http://www.first-to-fly.com/

Hot Air Balloons
Hot Air Balloon information. Find How Hot Air Balloon Works, Hot Air Balloon Rides, Hot Air Balloon Festivals, terms, facts and more. Get free listing for your hot air balloon company in our hot air balloons directory.
http://www.HotAirBalloons.com