This text from CNN:
For days, we've been talking about the last transponder signal the plane sent. And now it appears another system that sends data about the plane, the Aircraft Communications Addressing and Reporting System, was shut off, too. Authorities say the last transmission from that system came early in the flight, at 1:07 a.m. But they say they don't know exactly when the system was shut down, as the next transmission wasn't due until 1:37 a.m. Someone inside the cockpit, believed to be the co-pilot, made the plane's last verbal communication with air-traffic controllers at 1:19 a.m., saying, "All right, good night." The transponder was then switched off at 1:21 a.m., authorities say, and all civilian radar lost contact with the plane altogether about 1:30 a.m. Military radar last detected the plane at 2:15 a.m. off Malaysia's west coast, hundreds of miles off-course. And at 8:11 a.m., more than seven hours after takeoff, a satellite made the last electronic connection, known as a "handshake," with the plane.
If the ACARS is off, what system is this handshake coming from?
Yves