easyJet says the 26-year-old is its youngest ever commercial female airline captain.
She flies to around 100 destinations across the world and says most people "are pleasantly surprised and impressed" when she tells them her age.
Last year the airline company announced a plan to increase its number of female pilots.
But Kate isn't the youngest ever female captain.
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Ronan Milne got in touch with Newsbeat to say his colleague Dawn Hunter was made a captain aged 24 at Loganair.
Sarah Hendry is also 24 and a captain with the same company.