>Viv,
>
>>(a) What passenger load factor did you apply?
>
>I'm pretty sure the 4 L / km / passenger would be the average load factor. Airbus claims it's as low as 2.8L but that is for the larger planes not used in short hops.
>
>>(b) Did you count H2O as a greenhouse gas?
>
>No, because it isn't a greenhouse gas.

Water vapour at high altitude is considered so - though estimates of it's actual effect vary.....

>
>>(c) any factor for radiative forcing?
>
>I don't know what that is.

I think it's explained in the link. Basically the effect of CO2 emissions at high altitude are much more of a problem than at lower levels.

>
>>This link shows between 149-260/gm/km for European flights:http://lipasto.vtt.fi/yksikkopaastot/henkiloliikennee/ilmaliikennee/ilmae.htm
>
>I'll have to check the link later. Is that fuel consumed or greenhouse gas emitted?