DATABASES, KNOWHOW
Airliner productionlists
Airline logos, aircraft specifications
Company & aircraft directory
Aircraft Operator Agencies Designator search engine
ICAO Doc. 8585 (via Eurocontrol)
Aircraft Type Designators search engine
ICAO Doc. 8643
Airliner production lists
Aircraft registration lookup
Airline directory; loads of data
Production lists and histories of most major airliners.
ATDB - AeroTransport Data Bank
Commercial database with daily updates.
Commercial software with weekly updates. (I use it since years to organize my logs and images)
Reference, weather, links
Planespotters.net Airliner Production Lists
Production lists of Russian aircraft.
Airline seat maps
Airports, navaids