DTC Duat Service
Free FAA certified DUAT service, weather, and flight planning. Text weather briefings; weather maps, including state NEXRAD flight planning and filing. All services are free. Affiliate Member.

CSC DUATS
Free FAA certified DUAT service, weather, and flight planning. Text weather briefings; weather maps, including state NEXRAD flight planning and filing. All services are free.

National Weather Service
Aviation Weather

Nav Canada
The NAV CANADA Aviation Weather Web Site (AWWS) provides flight-planning capability via the Internet for your convenience. This capability includes aviation weather, NOTAM and electronic flight plan filing applicable to flight operations within Canadian Domestic Airspace.

Aviation Weather Center
The Aviation Digital Data Service (ADDS) makes available to the aviation community text, digital and graphical forecasts, analyses, and observations of aviation-related weather variables.