With regard to logos, we now have due to Rod the most comprehensive listing of logos to 3 letter designator codes as issued by the FAA. Any 3 letter codes that I have passed to Rod requiring a logo, that code for a particular aircraft company will have superseded any details relating to it already in the logo file.
The FAA do list details of any deletions but due to the large amount of changes that there could be they do not show any retrospective deletions only the most recent ones. It will therefore be difficult to keep completely upto date with deletions in our logo file although, as stated, the file is as correct as possible.
I have , however, managed to obtain some current deletions :
COA - Continental Airlines
FRL - Freedom Airlines
GRE - Air Scotland
NHA - Nantucket Shuttle/Horizon Air Charter
TUK - New Island Connections/Ocean Wings Commuter Service
VDR - Air Vardar
WCC - Sports Air Travel
No doubt, over the course of time, more will come to light.
Ian