Little-known reason why you should always avoid seat 11A when booking a flight.

There’s an interesting reason to steer clear of seat 11A when booking your flight.

If you end up in that seat, you’ll find yourself wedged in the middle of the plane with no view to enjoy.

This seat doesn’t have a regular window; instead, it features a small circular window that offers a limited view.

So, what’s the deal? An expert from Flight Radar 24 explains that “Ryanair’s seat 11A lacks a proper window due to the Boeing 737’s cabin air conditioning system.

“The air conditioning in modern commercial aircraft is managed by two ‘packs’ that control the airflow and temperature in the cabin. Air is distributed from these packs to the passenger area through a network of ducts integrated into the aircraft’s sidewalls.”

One of the ducts can be found next to seat 11A in the cabin of the Ryanair 737-800.

To make matters worse, the passenger in seat F across from row 11 has a perfectly positioned window to enjoy, leaving your view from 11A limited to peering down the aisle at that far-off porthole.

Honestly, the poor folks in seats 12A and 12F don’t have much of a view either, but at least they aren’t staring at the solid wall that 11A offers.

If you’d like a sneak peek at what kind of view awaits you from your window seat, check out a site like AeroLOPA, which features floor plans for nearly every airline’s aircraft.

You can find out about the legroom available and what kind of window view you might expect.

Interestingly, if you choose a seat on the right side of the plane—specifically seats D, E, or F—you may enjoy a bit more legroom on a 737 due to its slightly asymmetrical design.