Actually, Rav Ahron Kotler Zt”l was extremely terrified of flying. Though he flew often, he would usually absorb himself in his learning from begining to end.
On one occasion he was telling over a shiur to another talmid chochom on the flight. After about 2 hours after take-off, when he finished discussing the shiur, he chanced a look out the window. Not realizing that they had taken off, he shrieked out an “OY!” and quickly opened a sefer.
I think we all agree that he did not have an emunah issue.
Perhaps the afformentioned Rav was refering to a logical fear of the dangers of flying as opposed to the more illogical phobias.