Kate Middleton often travels by royal jet whilst heading abroad on a state visit.
She will normally join her husband Prince William, as well as bringing along her two children Prince George, 4, and Princess Charlotte, 2.
Despite the usual royal rules not allowing two heirs to the throne to travel together, they have been given permission by the Queen not to do so.
The Duchess of Cambridge also broke protocol when heading abroad to the Netherlands last year.
Kate was spotted on a British Airways flight in October 2016, when returning from her first solo foreign trip.
The royal visit, which included a visit to the Mauritshuis museum, then ended as she took the commercial jet back to the UK.
She joined other passengers on the plane at Rotterdam, with “fellow flyers excitedly taking pictures of her on their mobile phones,” according to the New Zealand Herald.
She was escorted onto the flight with her bodyguards and team, who stayed with her during the 50-minute flight.
As the flight landed, she was also the first to be taken off the flight with a car on the tarmac waiting for her at London City Airport.
It may come as no surprise that she chose the British airline, due to her mother, Carol Middleton, having previously been a flight attendant for the company.
It also isn’t the first time that royals have flown commercially.
Both Prince William and Prince Harry have been spotted on numerous occasions flying on commercial jets.
The young royal couple once made a shocking mistake when travelling.
The family were due to board a train from Chester Railway Station back to London last Sunday.
They then missed their 2:33pm train, a common occurrence for everyday commuters.
However, they were instead allowed to board a private empty train to Crewe where they caught the second part of their train.
