- CW3 Trenton Wilms
- CW4 Phil Campbell
- Czech Air Force
- D-Bar Helicopter
- D. Baker
- D. J. Vegh
- D.C. Rotor and Wing
- Da Vinci Helicopters
- Daar & Newman Professional Law Corp.
- Dakota Air Parts
- Dale Goodman
- Dale Rodgers (Bell 47 enthusiast from North Carolina)
- Dallas Police Department
- Dameion Rutherford
- Damiano Gualdoni
- Damin Helicopters
- Damon Duran
- Dan Greene
- Dan Kallenberger
- Dan Kosin
- Dan Rice
- Daniel George
- Daniel Liron
- Danish Navy (Sovaernets Flyvetjeneste)
- Danny
- Danny Rodriguez
- Dare County EMS
- Darren L. Taylor
- Darryl Morrison
- Dartmouth-Hitchcock Medical Center
- Dave
- Dave Busse
- Dave Clyde
- Dave Pitts
- David
- David Back
- david carnell
- David D. Koch
- David Eyre
- David M. Vanderhoof
- David Sadok
- David Shortland
- David Spence
- Davide Cerutti
- DCS Europe plc
- De Cecco Company
- Dean Fex
- Dean Mooney
- Dean N. Murfield
- Defence Helicopter Flying School