As spring transitions into summer, holidaymakers are preparing for getaways around the world. Passengers on planes may notice small holes in the windows, known as 'breather holes' or 'bleed holes'. These holes help regulate pressure between the three layers of the window, ensuring passenger safety during flight. The outer layer is designed to handle impact and pressure, while the holes prevent pressure differences from building up. Additionally, the holes minimize moisture accumulation and fogging between the window panes. Flight attendants also greet passengers to assess their well-being and conduct safety evaluations before departure.