Fuel dumping

From:         gclst1+@pitt.edu (Grant C Lynde)
Organization: University of Pittsburgh School of Medicine
Date:         30 Jun 94 00:34:18 
Followups:    1 2 3
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When is fuel dumping used?  I understand that it may be necessary when a
plane has to make an emergency landing.  But is it ever used on a regular
basis?  And if so, wouldn't this become an environmental problem?  

Next question is this, and it applies more to the business side of
airlines.  Allegedly, one of the biggest problems facing the airline
industryy in the US is over-capicity.  But airlines, such as US Air, are
asking for labor concessions to speed up turnaround time with the
intention of increasing the number of flights between cities such as
Pittsburgh and Philadelpia.  So, if there is already overcapicity, and
this is causing much difficulty within the airline industry, why are they
taking steps to increase the number of seats flying at any given moment?