A passenger jet burns 10-15 liters of fuel pr km. Stockholm-Geneva is about 1600 km, so 3200 km round trip. So the numbers seem at least to be in the right ball

A passenger jet burns 10-15 liters of fuel pr km. Stockholm-Geneva is about 1600 km, so 3200 km round trip. So the numbers seem at least to be in the right ball park. Here's a bunch of physics if you're into that sort of thing: https://therocketscienceblog.wordpress.com/2016/08/01/how-much-fuel-does-an-airplane-use/ https://therocketscienceblog.wordpress.com/2016/08/01/how-mu...