http://www.nytimes.com/2005/12/21/na...tml?oref=login
If you're not registered to read NYTimes articles you may not be able to
access this - maybe someone has a more user-friendly source for this
article.
I'm not sure how frequently they would want to be using 13L at JFK and 04
at LGA simultaneously, but the case is well demonstrated anyway.
GF