World war 1 was mostly a large, stagnant front line.
I'm sorry, you really don't seem to know that much about the Great War.
The Western Front was largely- though by no means strictly- a stalemate... sure, stagnant. Basically, whoever was defending tended to have a large advantage over whoever was attacking that day. However, notwithstanding the many Western Front mobile battles, there were many fronts to the war, including the massive and largely mobile Eastern Front (over 15,000,000 casualties).
Anyway, you're also wrong about the plane battles; air warfare never reached the scale of WWII, but access like Manfred von Richthofen obtained dozens of kills; hard to do without hundreds of planes.
Regardless, the First Works War was a time of industrial scale war, technological advancements, massive mobilization, vast societal change, and is a time period that, when you look into it, is not all that different than the next war.
I recommend The Great War YouTube channel; it follows the war as it would have happened 100 years ago. Spend 10 minutes a week with well-presented stories about the War to End All Wars, and you might change your mind about not being as 'sexy' as WWII.