Originally Posted by
galaxy flyer
Already required for Class B, C, D airspace, not much left is there?
GF
There's a lot of really busy E that only relies on one old transponder checked around a year ago. And enough of the ridiculous class B shelves; if they want that the responsibility should be 100% on ATC to slow 121 traffic down, not one pilot heads down in charts plotting radials while the other, even if they can identify it, drops slats and flies 7+ degrees nose high, low energy and slow for the supposed purpose of traffic avoidance.