There's a distinct difference between flight visibility and
ground visibility. Knowing the distinction helps you safely (and
legally) maneuver an aircraft when the visibility is poor but not
below required minimums.
Reno, NV. Five days of racing (Wednesday through Sunday 13 - 17
September 2006) by six different classes of aircraft, racers reach
speeds of over 500 mph -- by far the fastest-moving machines in
motorsports!
Source: Astronaut Heidemarie Stefanyshyn-Piper,
upon stepping out of the airlock on the International Space Station
Monday morning to begin the first of three planned spacewalks for
the crew of the space shuttle Atlantis.