Aviation

AeroTransport Data Bank
Paid subscription site provides information on all airlines and transport aircraft operators, worldwide, with history on aircraft and airports.
http://www.aerotransport.org/

FlightStats
Real-time flight status and historical flight delay information.
http://www.flightstats.com/

Professional Pilots Rumor Network
Discussion forum covering most aspects of aviation.
http://www.pprune.com/

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