If you are on the World Wide Web and searching for information on aircraft design, then a visit to http://www.aircraftdesign.com/other.html should help. Here, you will find a host of links to sites that deal with both aircraft design, images, museums and links as well as virtually every technical and professional society that deals with any aspect of aircraft. There are also links to many aircraft and CAD companies that support aircraft design as well as links to government organisations and universities that are involved in aircraft design.
At http://oscar.lboro.ac.uk/acdes/resources.html, there is also a number of resources that can take you to sites that describe aircraft design software and design infomation sources. Links to many NASA sites can also be found here, as can details on applied aerodynamics.
The Langley Technical Reports Server (LTRS) which can be found on (http://techreports.larc.nasa.gov/ltrs/ltrs.html) is a service which allows users to search available online NASA published documents, including meeting presentations, journal articles, conference proceedings, and technical reports. Many of documents are available in compressed PostScript and PDF formats. All documents are unclassified and publicly available. Needless to say, there is a lot of information for the aircraft designer here.
Finally, do not forget to visit the Hotlinks section of the Design Engineering site, where you will also find links to many aircraft manufacturers. – Dave Wilson.