FlightAware just published their latest update on the state of ADS-B equipment on the US general aviation fleet.  is a very interesting series of pictures.  It appears that about 20% of the fleet is not yet compliant.

This not necessarily bad.  Many of these are old and the cost of compliance may not be worth it.  The next chart helps to illustrate this. The red is the number of the fleet not yet compliant.  Click the image to make larger. You will notice those aircraft with a higher amount of non-compliance are probably not going to go for it.

Here we have a chart that shows this well.  For many models, the number is under 50%.  We think this sends a signal.

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