There is a section comparing flight emissions to US citizen average total emissions. This might make him feel good, but only 30% of an average American's emissions come from transportation and just a sliver from flying, so it's very likely his total emissions are much higher.
I believe you misunderstand what "average" is: Americans (or people in general), on average, do not fly much.
Some — eg. those who've moved for work — probably fly 10-15x the average, and 10-15x of people fly 1/100th of average. Flying cost and availability correlate with average needs, but that presupposes that some people have higher needs altogether.
