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lies and statistics ...

lies and statistics ...

lies and statistics ...

From Flight ... "At 6% of flights, long-haul services emit 51% of CO2: Eurocontrol"

are long haul a/c bigger than the others ? 6% of the flights, account for a much higher fraction of seat.miles (but that's not a "good" a story.

are long haul flights longer than the others ? 6% of the flights accounts for a higher fraction of flight hours ...

if we didn't have those long haul flights, would we have "any" ?? (many short distance flights are connections; many short distance flights can be traded for other modes, that probably create more CO2 ...)

another day in paradise, or is paradise one day closer ?

RE: lies and statistics ...

ok 6% long haul and 94% short haul ...

assume long haul flights carry 5 times the number of passengers (200 vs 40) ... then it looks like 6%*5 = 30 verses 94%*1 = 94
now assume long haul flights are 5 times longer (2000 miles vs 400) ... now its 30*5 = 150 verses 94*1

so long haul flights have 150 passenger seat miles verses 94 passenger seat miles for short haul and long haul generates about the same CO2 emissions ...
actually it's a good deal ... long haul flights are more efficient than short ! (which I think is what we would've expected)

another day in paradise, or is paradise one day closer ?

RE: lies and statistics ...

That's stated in this article:

Quote (https://www.flightglobal.com/networks/at-6-of-flig....)

Eurocontrol points out that 6% of long-haul flights departing Europe account for 10% of seats and more than 40% of seat-kilometres.

With this in mind, data shows that short-haul flying is arguably a bigger polluter when measured in emissions per seat kilometre, because a much larger proportion of the flight time is spent on take-off and landing, which use significantly more fuel than level flight.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: lies and statistics ...

Rating things is based on the desired argument outcome.

It seems simple enough - if one is concerned with the profitability of running an airline then CO2/seat-mile is really just a stand-in for pounds of fuel per seat-mile. If one is concerned with pollution - look at where the fuel is burned regardless of the number of seat-miles. It's not like there is passenger ship competition for the typical airline passenger so any per seat-mile comparison is meaningless but for year-over-year profitability.

RE: lies and statistics ...

Quote (IRstuff)

That's stated in this article...
Nobody is supposed to read the article. Today we just peruse the headlines.

Brad Waybright

The more you know, the more you know you don't know.

RE: lies and statistics ...


RE: lies and statistics ...

guilty too (particularly when I've exceeded my free reads ...)

another day in paradise, or is paradise one day closer ?

RE: lies and statistics ...

Rates are about profitability. Pollution is about total quantity.

RE: lies and statistics ...

Hmm. A 737 gets at best about same C02/km-seat as my '82 Benz 300TD, single occupant -.08 kg/km-seat for the benz. No movie or peanuts included though.

RE: lies and statistics ...

Which generation 737 and 747, there's only 40 years or so variation in engine technology for both those aircraft.

Edit: and how I have read the first charts legend, so -400's for both so 90's engines.

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