Message board for Challenger ultralights owners.

Airshows information club, photographs and calendar. Post information and exchange airshow information.

Military aircraft movements bulletin for UK and Europe including database archive for RAF Mildenhall and RAF Lakenheath. Advance news of air exercises and deployments plus trip reports from around the World.

Mailing list dedicated to Robbe/Schluter helicopters

Discussions for builders of Mark Drela's designs including the Allegro-Lite.

Radio Control Soaring Exchange mailing list hosted by Airage Publications. (groups.yahoo.com archive)

Discussion forum on cross country R/C soaring.

Group discussions on using the XFOIL airfoil design code.

The official club of the Association of Aviation Ordnancemen, a club for people who work or have worked with aviation ordnance in the US Navy, Marines, Air Force, and Army.

Unmoderated discussion group for aircraft spotters in or visiting So. California. Requires free Yahoo account to post. Includes messages, live chat, files, photos, a calendar and links.