400 feet vertical, 1.6 miles horizontal, closest approach. Rapid descent obeying TCAS warning (RA?) leads to CC injuries:
FAA probes close call of Spirit jet, small plane
A319 was climbing out of Detroit at 14,400 ft.
"DETROIT (AP) — The Federal Aviation Administration said Monday it is investigating a close call between a Texas-bound Spirit Airlines flight and a skydiving plane that forced the jetliner to dive sharply over Michigan, as screaming passengers feared the plane was going to crash.
Flight attendants bumped their heads and luggage spilled out of overhead binds during the incident Sunday evening....
...Only after the dive was the pilot able to give out information, announcing only that a "flight control issue" led to the maneuver."