This is definitely true, but it's also a little disingenuous to compare in pollution-per-passenger-mile because commercial flight makes traveling further so muc

This is definitely true, but it's also a little disingenuous to compare in pollution-per-passenger-mile because commercial flight makes traveling further so much easier. With the ability to travel from JFK to LAX in 6 hours, significantly more people are traveling far distances that they wouldn't have bothered to travel if the only option was train/cars. Speaking as someone who likes to fly to remote places, planes may be more efficient per mile, but people travel significantly further in them and likely end up contributing quite a bit more to global warming than people who don't fly and just drive to a lake a few hours away instead.