On 28 Jun 2005 06:16:08 -0700, wrote in
.com::

If I compare a 4 hr drive I need a least about 3 hrs to do the same
journey by plane

Right. The additional overhead of flight not withstanding, if one
were to average 60 mph on the road for four hours, s/he'd have to make
160 mph to cover the same distance by air in 1-1/2 hours. Of course,
that analysis doesn't take into account commuter congestion on the
highway that may reduce the 60 mph average speed significantly.