US Operators and ADS-B Out
I was wondering if the current US airline operators (CO, WN, DL, XE, etc) have the capabilities to transmit ADS-B out on all of their aircraft already. If so, are they (the operators) waiting on the mandate in 2020 to become active before they use it on every flight (regardless of overseas ops or not)?
Reason I ask is that I do have an ADS-B receiver and while I see the aircraft that obviously need ADS-B (international overseas flights), I sometimes see sporadic flights that don't usually need ADS-B. For example, a CO flight from IAH-MCO (753) will show up, but not a XE flight from IAH-MCO. And a Citation flying domestically will show up, but not a WN flight. Is this purely because of ops, or do these aircraft not have the ability to transmit yet?
Thanks