[hermgem]

He’s throwing percent numbers around while talking about aircraft.
Fact is: It’s percent emission reductions per passenger or seat.
In other words go sell cheap seats, pack ‘em like sardines and voila you got great passenger fuel mileage.
Such counting overrides higher total exhaust per fully loaded plane.
Two planes, one’s emitting less while carrying a lighter load, the other spews out more with a heavy load.
Oh yes, it's this carbon offset difference that saves us from global warming.

[Paleo Conservative]

A complicating factor is that airlines mix freight and passengers on the same flight. A flight with lots of empty seats may make make more revenue due to the extra freight that can be carried both by weight and volume.