I have noticed that VFR flight following aircraft are no longer being displayed or tracked, even those going 500+miles. Why?
VFR flight tracking was always outside the scope of our data feed from the FAA, but it used to work intermittently (generally longer flights handled by center). On August 22, 2010 the FAA performed a major upgrade on their systems bringing the system mostly into compliance with the policy and we haven’t seen many VFR flights since.
If you’re an AOPA/EAA/etc member, let their government affairs office know you want to see VFR flights in the ASDI feed.