It would be a problem for any frum woman or girl, because you’re secluded in the front with another pilot for hours on end. Unless she can always secure the company of another female, I think it wouldn’t be wise. I don’t know Halacha, just common sense.
That would apply to men also, who would be in a cockpit with a woman sometimes.
But you didn’t think of that.
You only think of this stuff for other people.