My mom was diagnosed with meningiomas just a couple of days ago, is it safe for her to take a flight?

My mom is about to take a flight of about 4 hours. She was diagnosed with meningiomas just a couple of days ago, the tumor was of size 5.8 cm, situated at right front temporal. I was wondering if it is safe for her to take the flight because I read that people with brain tumor were not advised to fly. I am not sure if she should take the flight. She has recent become sensitive to buses on bumpy road, but she is not bothered at all if buses is on the highway or better roads or have any car ride. I suppose that the tumor may have caused this problem. But I could be wrong on this. In any case, I would like to know if it is safe for her to take the flight. Any precaution or medicine for her on the trip?

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