Passenger aircraft also carry freight, and there are also various freight airlines, but it's strange that there is no mention of that in the article. In truth,

Passenger aircraft also carry freight, and there are also various freight airlines, but it's strange that there is no mention of that in the article. In truth, we may be also responsible for aviation emissions even if we are not flying; simply by clicking the "Order" buttom on some faraway e-commerce site, or posting something via airmail...