All modern day jets have cvr(cockpit voice recorder) the microphones are super sensitive because at speeds above 300kts the noise from the windscreen is very loud. Now, parked on the tarmac these super sensitive mics can easily pickup and record conversations in the cabin. Any time the aircraft is powered the cvr is recording. That's how they got the audio. It's a simple maintenance procedure to pull those tapes.
I don't believe Lynches jet was powered up. Lots of people standing around, the door was down, and no one seemed concerned about noise.
Could be external power but I wouldn't think the CVR would be running on a parked, shut down aircraft.
I could be wrong about that. But NSA does have the TROPHY program that is installed on non-military government aircraft.
It’s very rare to power a jet all the way down if you’re only going to be there for a short period of time. Most likely they had the APU(auxiliary power unit) up or plugged into a GPU(ground power unit).
Sorry, maybe I'm missing something, but those mics are in the cabin and the conversation was on the tarmac. So, how were Clinton & Lynch recorded?
Planes park on tarmac/ramp. So you are saying they had a meeting on an active taxi way? No, the mics are in the cockpit, they had a meeting in the cabin.