Following on from my recent in flight experience here:
http://www.pprune.org/australia-new-...oke-cabin.html
I was a passenger early this morning on a 737-800 at cruising altitude (39,000 feet?), just south east of Roma according to the inflight map.
I was filling out the passenger arrival card when I noticed a flash across the seat back in front and turned toward the back of the plane to see another aircraft at the 4 o'clock position and heading at a 45 degree angle away to the south and at near enough the same altitude.
I wish I had taken a photo but it was definitely a jet aircraft with an unpainted/silver underside.
To me it 'appeared' that the other aircraft was very close and, thinking about it, would have been closer moments before I saw it.
Am I a paranoid passenger? Is this kind of thing normal?