According to wikipedia, Germany's economy (GDP $3.863T) is only about 4% of global economy (GDP $87.265T). Would you call Germany's economy insignificant?
More interestingly, there are only three nations (the US, China, Japan) with higher GDP. So, by the same criterion, we could argue that only these three countries have any significant economy (total $40.733T), and the rest can be ignored. But then we will be ignoring more than half of global economy! It's clearly a logical fallacy.
* Numbers taken from https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi...
Also, it seems intuitively obvious that moving N kg by plane is vastly less efficient than other forms of transport like rail or ocean shipping. We should be doing fewer energy-inefficient things and more efficient things.