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As spring transitions into summer, countless holidaymakers will be planning their getaways across the globe. Once settled into their aircraft seat, passengers may choose to gaze through the plane's windows. When they do, they might spot tiny holes in the glass.

A pilot has now revealed the purpose of those holes. The holes play a crucial role in regulating pressure within the aircraft, as plane windows aren't constructed from a single pane, but three separate layers.

These three layers, along with the holes in the central layer, help ensure the aircraft remains safe for passengers during flight. They are referred to as 'breather holes' or 'bleed holes', reports the Mirror.

Speaking on YouTube, one user, known as Mentour Pilot, clarified that the bleeder holes are positioned in the middle of the three window layers, according to UniLad.

He explained that the outermost of the three layers, closest to the elements, was designed to "handle impact and pressure difference". Yet, between that layer and the middle layer sits a pocket of air.

These bleed holes help regulate the pressure throughout the three layers and prevent forces from accumulating. He noted: "Differences in pressure and temperature would otherwise start causing forces to build up between the layers, trying to bend them inwards or outwards.

"That little hole is put there to allow air to flow through slowly and relieve that potential pressure difference." However, on closer inspection, the layer nearest to passengers does not feature this hole, as the pilot explained this particular layer is specifically designed to allow air to circulate around it.

The pilot also revealed that another reason plane windows feature holes is to minimise the chances of moisture accumulating between the panes.

He said: "It makes it more difficult for moisture to become trapped between the layers, and start fogging up your window."

This pilot is not the only aviation professional to have shed light on the customs and secrets of modern air travel, with several flight attendants also lifting the lid on why certain procedures are carried out - including why they greet passengers as they board the aircraft.

One flight attendant has revealed that their welcoming gesture is about far more than mere courtesy.

Taking to TikTok, flight attendant Mrs Miva disclosed that greeting passengers is also an opportunity to assess their wellbeing as they come aboard, while simultaneously conducting a safety evaluation before the plane departs.

She explained: "Did you know that your flight attendant greets you not only out of politeness, but also to check whether you are too drunk or sick to fly?"