In short, the study found "Overall, airflight was found to be safe for patients with brain tumors. Nevertheless, if patients have brain tumors and seek to travel by plane, they should have discussions with their neurosurgeon or neuro-oncologist to ensure individual safety."
I'm also tagging @wkindel and @nancye3 who might appreciate this information and have some additional thoughts to add.
Dimatahsin, are you planning to fly for medical treatment? What type of brain tumor do you have? Or are you asking on behalf of a family member?