The single-engine, four-seat Cirrus SR22 was on course for Kissimmee, Fla., and maintaining altitude at 11,000 feet, but had not responded to repeated contact attempts from controllers; at the same time, ten miles behind the Cirrus at 12,000 feet was Southwest Flight 821, a Boeing 737. Rather than following the protocol for unresponsive aircraft, the supervisor asked the Boeing to visually check the Cirrus cockpit. The Boeing did so, reporting 2 people in the cockpit. Both planes landed safely.
But the planes violated proximity guidelines. The Boeing could have caused air turbulence upsetting the Cirrus. They flew too close. As a consequence, the FAA suspending the FAA controller, and they are reviewing procedures, and training practices.