Following sources have been consulted to make the ROTORSPOT database what it is today
Carlos Abella / Roll Out
Alexis Antonakis / SPOTTERS
Andy Appleton
Tony Arbon / Austairdata
Ron Bartlett
Pieter Bes
Martin Best
René Biber
Jean Bizot / Helicophoto
Robert Branbergen
Winston Brent / African Aviation Series
Pascal Brugier / Registres du Monde
Ian Burnett
Chris Busby
Roger Caird
John Chapman
David Clarke / Dauphin 2 database
David Clarke / Daves Helicopter Gallery
Kevin Cleaver
Catalin Cocirla
Frank Cohen / Helisecours
Paul Compton / Nordic Research
Obrad Dabetic
Steve Darke / thai-aviation.net
John Davis
Jeremy Day
Mark Diekmann
Graham Drabble
David Eyre
Dirk Fassbender
Thomas Ferreira
Steve Fincken
Michael Flebbe
Peter-Michael Gerhardt
Pierre Gillard / Alouette & Lama
Rickard Gillberg / Nordic Rotors
Thomas Girke / Helicopter Data Base
Stewart Graham
Damiano Gualdoni
Jerry Gunner
Carl Hart
Martin Hausmann
John Hayles / Aeroflight
Graham Hector
Markus Herzig / Swiss Heli
Coen van den Heuvel
Peter Hillman
Les Hitchings
Derek Hoddinott 		Mike Hollick
Balázs Horváth / Hungarian Aviation
Roger House / Aviation Codes Central
Pete Hughes
Vojislav Jereb
Luc Jerome / Helimat
Terry Judge
Kimmo Ketolainen
András Kisgergely
Elisabeth Klimesch
Martin de Koning / Helifinder
Arno Landewers
Lionel Laporte
Dave Lenton / CopterCrazy
Joachim Lippl / Helionline
Pete Longley
Len Lundh
Clive Lynch
Alan Macdonald
Andy Marden
Søren Madsen
Doug MacDonald
Ian MacDonald
Jan Makkus / Aeroboek
Samuel Marti
Bernard Martin
Steve Martin
Patrick Mathieu / Heli-Union
Michael Mau
Frank McMeiken
Adrian Morgan
Tony Morris
Ioannis Mylonas
Sid Nanson
Ole Nikolajsen / Aviation in Turkey
Kevin Palmer
Jeremy Parkin
Keith Parkinson
David Paull
Leith Paxton
Andrew Pentland / Golden Years of Aviation
Andrei Popa
Ken Rijock
Giovanni Rodríguez
Dominique Roosens
Geoff Russell
Kiyoshi Sato
Dave Scully
Igor Seveliov 		Joachim Sjöström
Erik Skaarup
Wim Sonneveld
Jacob Struben
Tomasz Szymanowicz
Boris Tikhonov
Daniel Troncatti
José Ramón Valero / RNAC
Kristof Vandermoere
Martin Vavros
Peter Vercruijsse
Bert Visser
Henk Wadman
Peter Watson
Grant Williams
Dan Willink / AMCAR-USA
Peter Wilmink / NOTAR helicopters
Gordon Wimmer
Jörg Windmüller
Dave Wise
Joost de Wit / Aviaspotters
Remco de Wit
Luc Wittemans
Jack Wolbrink / Aviationweb déjŕ vu
Phil Yeadon
Stipe Zivaljic

+ the ones who wish to remain anonymous
Air-Britain News
Airnieuws
BUCHair HELIcopters
Flash
Heli-Euro
Helihub
JP Airline-Fleets
LAAS International
Midland Counties Publications
Rotorhub
Scramble
Scramble Messageboard - Helispot
Soviet Transports
Spotter's Nest
The Aviation Hobby Shop
TLAS Production Lists
UK-Copter website
Yahoo Groups - ABIX
Yahoo Groups - Copters
Yahoo Groups - GyroSpotters
Aviation links on the 'AirNet' web site Links to complete civil helicopter registers
Aircraft registers
Aircraft production lists: A to M
Aircraft production lists: N to Z 		Germany (Dave Lenton)
Germany (Joachim Lippl)
Italy (Damiano Gualdoni) 		San Marino (Damiano Gualdoni)
Sweden (Rickard Gillberg)
Switzerland/Liechtenstein (Markus Herzig)
Extensive helicopter accident database
Griffin Helicopters (Gary Spender)