"We were delighted to welcome the Duke and Duchess of Cambridge and their family aboard one of our flights again, this time when they flew from Norwich to Aberdeen with our franchise partner, Eastern Airways," a FlyBe spokesman told CNN in
FlyBe declined to tell CNN how much the flight cost. Prices for this route start at £ 73 ($ 89) with a fully flexible fare of £ 249 ($ 303).
Kensington Palace told CNN it had no comment on the matter.
environment blamed the couple for hypocrisy, saying Harry and Megan's actions contradict their public position on climate change, as aviation is one of the world's largest polluters and responsible for more than 2% of global emissions .
The environmental footprint of a private jet is also much larger than that of a commercial jet.
Singer Elton John defends the royal couple, however, and says media reports about their travels are "distorted and malicious." The star said he and his husband, David Furnish, paid for a private jet in Nice for security reasons and made a donation to a charity.
“After a busy year, continuing her hard work and dedication to charity, David and I wanted the young family to have a private vacation inside the safety and serenity of our home. To keep the much-needed protection high, we provided them with a private jet, "he posted on Twitter.
CNN's Bianca Britton contributed to this report.