All the heavy iron spends most of its time in Class ABC airspace for which the price of admission is at least a Mode C xpdr which allows the TCAS units to detect the small stuff.
Perhaps a Zaon PCAS would be accepted as an alternate means of compliance so that the small stuff can get out of the way.
Recreational GA and gliders generally operate in Class DEG and Flarm works very well for them at a very reasonable price.
Seeing as how light a/c are required to fit Mode C to operate in Class ABC, it's only fair to require the heavies to fit Flarm if they operate in class DEG
