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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