IP: Re: : Leave to the FAA

[Dave Farber <farber@cis.upenn.edu>]

>Date: Mon, 01 Jan 2001 11:21:31 -0800
>From: Ron Reisman <ronreisman@home.com>
>
>!!!Happy New Year!!!
>
>Dave Farber writes:
> > >They did it again, During a weather nightmare in the NE and backup all 
> over the FAA Air traffic control > >system web site 
> (http://www.fly.faa.gov/) says there are no delays either outbound or 
> inbound at any > >NYC/DC/Boston etc airports. Guess they took the weekend 
> off!!!
>
>This may be the result of sharing gov't. date with the public, and the
>difference in definitions between the two.
>
>During a 'weather nightmare' various Delay programs go into effect.  The
>'Ground Delay Progam' can generate new departure times for aircraft,
>called the Expected Depature Clearance Time (EDCT). An aircraft cannot
>take off before it's EDCT.  These terms, along with other interesting
>tidbits, are covered in the 'Definitions' page at the fly.faa.gov
>website.
>
>If an aircraft is scheduled to depart at time T, and then recieves an
>EDCT for T+3hrs., it is not considered 'delayed' within the FAA
>Flow-Control system, just 'rescheduled'.  The deviation between the
>original scheduled time of departure (ala OAG) and the EDCT is not their
>measure of 'delay'.  If conditions degenerate to the point where the
>EDCT are impacted, e.g. aircraft depart ~1 hour past their EDCT, then
>the FAA delay metrics activate.  I agree that this is all pretty arcane,
>and I don't know of any one site that explains it completely in laymans'
>language.
>
>I'll pass this on to [the] FAA System Command Center, and
>perhaps they can come up with a more public-freindly set of messages.
>He can add it to the dozens of improvements he plans for the site.
>
>In any case, hoping you & yours have a happy, healthy, and prosperous
>New Year!
>
>
>--Ron



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