The flying thing is weird. It’s really that you emit a lot because you traveled so far. It’s more efficient that driving per mile and slightly less efficient than rail (not sure the type)
So it should be don’t travel so far and if you have to, take a train and if there’s no train, carpool, but fly rather than drive if you are traveling alone.
Most people aren't driving across the country every time they need to go from the east coast to the west coast. If planes didn't exist these trips would also not exist.
Right, our quest for ever faster travel has led to consuming huge amounts of energy. Even something like the interstates has contributed to this by shrinking travel times to downtown and encouraging people to travel greater distances at higher speed.
https://yaleclimateconnections.org/2015/09/evolving-climate-...
So it should be don’t travel so far and if you have to, take a train and if there’s no train, carpool, but fly rather than drive if you are traveling alone.