Interesting People mailing list archives
IP: Re: : Leave to the FAA
From: Dave Farber <farber () cis upenn edu>
Date: Mon, 01 Jan 2001 16:08:59 -0500
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 allover 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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- IP: Re: : Leave to the FAA Dave Farber (Jan 01)