On Jul 18, 2008, at 3:26 PM, Iljitsch van Beijnum wrote:
On 18 jul 2008, at 9:47, Kurt Erik Lindqvist wrote:
so while I sympathize with the need for this, and won't argue
against it. I do want to point out that it means that overseas
travelers will be 'stuck' for another day (depending on where in
the world we are, you can normally make an afternoon overseas
flight, but not if we have an afternoon slot). So in order for you
to get enough data - I would strongly urge you to also have an
afternoon slot in a non-north american meeting location and only
afterwards analyze the data.
Actually the connections from Dublin to the rest of Europe aren't so
great that it's possible to fly back friday evening for everyone. In
my case (Madrid) I'm staying until saturday to attend the RRG
session that runs until five.
What might be illuminating is to to a quick poll on the RRG list so
we can correlate home region with:
- flying home after RRG on friday
- flying home after leaving RRG early on friday
- flying home saturday after RRG
And then of course the same for the extra sessions on friday in
Minneapolis.
The earliest flight I could find to Washington, DC after 5:00 PM
Dublin time is 6:00 AM the next morning.
The principal here is fairly straightforward - modern airliners travel
at very roughly the speed of the Earth's rotation at
45 degrees latitude. So, assuming that the latitude of departure and
arrival is roughly the same, for trips East the clock time difference
is roughly twice the trip duration, for trips West the clock time
difference is roughly zero. The jet stream flows West to East, and
thus slows down trips West and speeds up trips East, but this gives
the picture.
Airlines try and avoid leaving or arriving between mid-night and 6 AM,
and strongly prefer arriving and leaving during normal working hours
if possible. For intercontinental trips East of, say 8 hours duration,
the clock time difference will be 12 hours or more, and that gives a
preponderance of overnight flights, with a few in the early morning
arriving late the same evening. Going West, there is more flexibility,
as the clock time difference is small, but you will typically not have
any late evening flights, and lots of morning ones.
So, a meeting in the US can end at 5:00 PM and people will be able to
get flights to Europe that evening, but for a meeting
in Europe ending at 5:00 PM will generally mean a flight the next
morning.
For the very long flights that you get in Asia, these principles break
down. (For example, India to Europe flights frequently leave very
early, 1:00 AM or so local time. I was told by a pilot that the planes
from Europe refuel in India and return the same night and that with
the flight times and the refueling time it was not possible to put all
4 departures and arrivals during normal waking hours, and so one of
the 4 had to be in the middle of the night.)
Regards
Marshall
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