That is called premonition-dreams. Your friend has potential.
Since you already have the Medicine Master Buddha plaque, it also does provide for accrual for protection against accidental deaths such as automobile crash, air plane accident etc… This will be explained later in our current Medicine Master Sutra lectures.
To slice it in a different fashion: the premonition-dreams may reveal existing threats or mal-intentioned forces but they do not necessarily reflect the countervailing protective forces.
You therefore should not fear flying. When you do need to fly, please remember to recite Medicine Master Buddha’s name, i.e. mentally maintain: 藥師如來 (Yao Shi Ru Lai; Dược Sư Như Lai) repeatedly. It’ll calm your mind down while providing for additional protection.