Missing windows in certain plane seats, often referred to as "windowless window seats," are usually the result of the aircraft's internal engineering and air conditioning layout. Most modern jets, such as the Boeing 737 and Airbus A320, have vertical "risers" or air ducts that run behind the cabin walls. These ducts are essential for circulating air from the engines and cargo hold up to the overhead vents. Because these pipes require several inches of space, they are placed between the outer skin of the fuselage and the inner plastic panels, often blocking the spot where a window would normally be located. Additionally, airlines frequently change the seat pitch (the distance between seats) to fit more rows than the original manufacturer's design intended. This causes the seat rows to "misalign" with the pre-cut window openings in the airframe. In 2026, savvy travelers use sites like SeatGuru to identify these specific rows (often found in the middle of the cabin) to avoid the frustration of staring at a blank plastic wall during a flight. While it is a nuisance for passengers who enjoy the view, these windowless sections are a necessary compromise for the plane's life-support and ventilation systems.