It might be hard for them to find someone who is both fluent in english AND knows the field well enough to know vegetative electron microscopy is not a thing. Most universities have one general translation help service and science has a lot of field-specific weird terms.

If you account for check in/boarding times at the airport times are not so different either. However, one datapoint does not give a good overview of the situation and I found with most of my travel plans trains were more expensive than planes for the same routes within europe.

You don’t have to be perfect in a boycott. Avoid what you can, not what you can’t.