Kate Middleton Flies Commercial — Plus See 9 More Ways She and Prince William are Breaking the Royal Rules!

Kate Middleton is just like us — and flies commercial!

The 34-year-old Duchess of Cambridge surprised unsuspecting plane passengers on Tuesday, Oct. 11 when she boarded a British Airways flight to London following a day-trip to the Netherlands.

Twitter photos of Kate on the aircraft show her still donning the pretty, blue Catherine Walker skirt suit she wore earlier on Tuesday during a meet and greet with King Willem-Alexander.

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Though Kate and her husband, Prince William, 34, often travel via private jet, the couple has flown commercial in the past. They previously took a British Airways flight from LA to London in 2011.

Click through the gallery below to see more ways Kate and William are breaking the royal rules!