What does this idiom mean: "High flier"?

[Rich7]

Test No. 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
(c) pilot
(d) goer

Test No. 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: 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.
_________________________

what's this?

[Torsten]

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

TOEFL listening lectures: A lecture by a professor of Sociobiology