Aaaaaactually, Folks,
At last estimate, the count of how much of the US airline fleet is ADS-B "ready" varies between about 18-28%, and the capacity to modify the balance before deadlines simply does not exist ---- and huge political pressure is being exerted for a long extension, 10 years has been mentioned in polite company.
Of course, part justification is based on arguments that FAA's ATC modernization program is way behind timetable and over budget.
The GA fleet situation is better, but not by much, having the choice between 1090ES and a much superior broadband system.
Tootle pip!!