What does this idiom mean: "High flier"?

Test No. [color=blue]incompl/inter-56 “High and Low”, question 9

The moment she joined the staff you just knew she was a high and it was no surprise when she got promotion within six weeks.

(a) sailor
(b) flier
© pilot
(d) goer

Test No. [color=blue]incompl/inter-56 “High and Low”, answer 9

The moment she joined the staff you just knew she was a high flier and it was no surprise when she got promotion within six weeks.

Correct answer: (b) flier

Your answer was: [color=red]incorrect
The moment she joined the staff you just knew she was a high sailor and it was no surprise when she got promotion within six weeks.
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what’s this?

A high flier is a person who advances in their job or career very fast.[YSaerTTEW443543]

TOEFL listening lectures: A lecture by a professor of Sociobiology[YSaerTTEW443543]