> For the entire flight, right? I would be curious how much driving one seat on a flight equates to. I presume flying is at least better than driving on a per-mile basis?

You can’t compare the two so cleanly as to conclude with a simple this is better than that. There’s different effects of different types of pollutions at different altitudes, some unknown. Brake dust, the knock on effects of needing more road due to more miles driven, the infrastructure required to operate an airport, etc.