Sorry - I don’t expect you to change your own habits or something, this isn’t personal. I work in this space, so to me it’s just a fact and not a matter of opinion. Air travel results in higher carbon emissions per kg-km than road travel by about an order of magnitude. Even for long haul flights.

The GREET model: https://www.energy.gov/eere/bioenergy/articles/greet-greenhouse-gases-regulated-emissions-and-energy-use-transportation