That pre-flight announcement isn’t arbitrary. Here’s why seat backs must be upright for takeoff and landing.
You’ve boarded your plane and gotten yourself settled. Your carry-on bag is in the overhead. Your handbag is under the seat in front of you. You’ve sanitized EVERYTHING. You’re ready to go.
OR….
You’ve been on the plane for hours. You’ve enjoyed your stroopwafels. You drank your whole can of Diet Coke and subsequently used the lavatory (hopefully it wasn’t this one – what a view?!?!). You’re just ready to be DONE and OFF THE PLANE.
Either way, you suddenly hear this part of the flight attendant’s announcement:
“…Please place seat backs and tray tables in their full upright position…”
The tray tables would make sense…everything on them could become projectiles in the event of an emergency. When they’re down, they also make it virtually impossible to leave your seat (also needed for an emergency evacuation situation).
But what’s up with keeping the seat back all the way up? Turns out there are a couple of reasons:
Clearer Visibility for Safety Checks
We’ve said it a bajillion times: a flight attendant’s main job is to keep their passengers safe and to do what needs to be done in the event of an emergency. Sometimes that requires seeing outside the plane – is the wing on fire? Is the engine intact? (Here’s how they determine which windows to use for observation) If everyone’s seat is upright, it’s easier for the FAs to see out the window.
Unobstructed Exits for Faster Evacuations
Even though you’re only allowed to “lay back” a couple of inches in any seat except the mondo expensive ones, you’re still going into the space of the person behind you (whether they like it or not. Remember this lady? LOLOL!). During an emergency situation where you have to leave your seat, anything encroaching on that space—even a couple of inches—makes it harder. If something really bad is happening to a plane, no one wants to slow down an evacuation to navigate around a reclined seat.
The Physics Behind Upright Seats
This rule isn’t arbitrary—it has everything to do with physics and safety during an emergency. When your seat is up, it’s locked. When your seat is reclined, it’s not locked. In an emergency, an unlocked seat would have more force during impact, and the thrusting forward of the seat could cause passenger injury.
Protecting Passengers During Impact
Think of it like a catapult—the further back your seat is reclined, the larger the distance your head and body travel during an impact, generating more force. Even a slight recline could increase the risk of whiplash or other injuries. And that’s why. 
So while it might feel like just another pre-flight rule, there’s a lot more behind it than convenience.
Keeping your seat upright helps crew members see what’s going on, makes it easier for everyone to get out quickly if needed, and reduces the risk of injury during an emergency.
In other words, it’s a small adjustment that can make a big difference when it matters most.
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