Keep your Mac screen private on a plane, even in the middle seat

On a plane, whoever sits beside you can see your screen for the whole flight, and in the middle seat that is two people. Book a window seat if you can, set Dark Mode and low brightness for the dark cabin, turn off notification previews and limit AirDrop before you board, and save the most private work for the ground. For the rest, Shoji can keep only the window you are using sharp, and cover the screen by itself if you nod off.

The cabin is an odd place for privacy. Nobody is trying to read your screen, exactly, but there is nothing else to look at for hours, and your laptop is the brightest thing in the row.

Who can see your screen, seat by seat

Your screen faces backward, toward you, so anyone behind you looks at it from almost the same direction you do, and anyone beside you sees it at an angle.

• Middle seat. Both neighbors, at an angle, for the length of the flight. They do not have to read much at once. Over a few hours, a glance here and there covers a lot.
• Aisle seat. One neighbor, plus everyone in the aisle: the crew with the trolley, people heading to the lavatory, and the line that sometimes forms right beside you.
• Window seat. One neighbor and the wall. If privacy matters on a flight, this is the seat to book.
• The row behind. Through the gap between your seat and your neighbor’s, the person behind you can see over your shoulder, and a tall passenger can see over the seat back.

On a night flight the cabin lights go down, and a bright white screen can be seen from rows away. It is the easiest thing in the cabin to look at.

Set up your Mac before you board

These are worth doing at the gate, or the night before, while you have a connection and room to think.

1. Switch to Dark Mode. In System Settings, open Appearance and choose Dark. A mostly dark screen in a dark cabin draws far fewer eyes than a white page. Many apps and websites follow it, though some pages stay white.
2. Turn the brightness down. Use the brightness keys or the Display slider in Control Center. In a dim cabin you need much less than you think.
3. Stop notification previews. In System Settings, under Notifications, set Show previews to Never, or turn on Do Not Disturb from Control Center for the flight. If you buy the onboard Wi-Fi, messages start arriving mid-flight, and a preview banner is the one thing on your screen you did not choose to show.
4. Limit AirDrop. Set AirDrop to Contacts Only, or turn receiving off, from Control Center or the AirDrop window in Finder. A plane is full of strangers’ devices within range.
5. Check your Mac’s name. It is what nearby devices see, and it often includes your name. You can change it in System Settings, under General, then About.
6. Decide what not to open. The contract, the salary spreadsheet, the medical form: some work is better done after landing, whatever else you set up.

While you work in the seat

In the middle seat, the window you are typing in is in full view of two people. The honest answer for that window is a physical privacy filter, which darkens the screen for anyone looking from the side. No software changes the angle a screen can be read from.

The rest of the screen is where software helps. macOS can put one app in full screen, or hide everything else with Hide Others (Option-Command-H), so only one thing is showing. That works until you need two windows at once, and then switching brings a whole app back into view for both neighbors.

Shoji’s Focus Blur takes a different route. Only the window you are using stays sharp, everything else softens, and the sharp spot follows you as you switch. The reference document beside your draft, the email you were answering, the chat on the other half of the screen: your neighbors see their shapes, not their words. If you are on the onboard Wi-Fi, Messages, Slack and Mail can stay blurred unless you are the one using them, and holding Option over one lets you peek.

When the crew arrives with drinks or your neighbor turns to say something, the quick blur covers everything with no password, and esc brings it back.

When you sleep, eat or get up

Planes are full of interruptions, and each one needs a slightly different answer.

Dozing off. This is how a screen ends up on show for an hour. Shoji’s away timers handle it: the screen can blur after a minute with no input and lock after five, or any timing you set. One thing to know: the timer waits while a video or call keeps the display awake. If you fall asleep during a film, the film stays on screen until it ends, which is usually fine for a film.

A real sleep. Close the lid. A MacBook sleeps when you close it, and if your Mac asks for a password immediately after sleep (System Settings, Lock Screen), it is locked until you open it. A cover that keeps the display on is right for short breaks, but the display draws power, and on a long flight you want the battery.

Letting the window passenger out. You stand in the aisle with the laptop on the seat or in your hand. Lock with Shoji’s Command-L first. A screen slides shut over everything, your music or download keeps going, and the keyboard belongs to the lock, so nothing pressed while the laptop is being shuffled around reaches your apps. Touch ID opens it when you sit back down, which beats typing your password with two neighbors watching.

The lavatory. Take the laptop, or lock it. If you leave it locked, each wrong password makes the next try wait longer, and you see every failed try when you come back. After an away time you choose, Shoji also turns on the real macOS lock.

What none of this covers

• The window you are typing in. Focus Blur keeps it sharp so you can work, which means it is readable from beside you. Only a physical filter helps there.
• Cameras. Anyone can photograph a screen, and nothing on the Mac prevents that.
• Onboard Wi-Fi. What crosses the network is a separate problem from what is on the screen.

What you do not need for any of it is a connection. Shoji goes online only to activate the license and check for updates, so activate it before you fly. It asks for no Screen Recording, Accessibility or Full Disk Access permission, because the blur is drawn by macOS and the app never captures the screen. It is $14 once, free for 24 hours, and runs on macOS 14 or later, on Apple silicon and Intel.

Questions

What is the most private seat on a plane for working on a laptop? A window seat. You have one neighbor instead of two, nobody walks past behind you, and you can angle the screen toward the wall.

Should I just close the lid every time? For anything longer than a few minutes, closing the lid is a good habit, because it saves battery and, with the password set to Immediately in Lock Screen settings, locks the Mac. For a drink, a quick chat or letting someone out, a cover you can open with a finger is faster.

Does Dark Mode make my screen harder to read from the side? It does not change the viewing angle. It makes the screen dimmer overall, so it stands out less in a dark cabin and is less likely to catch the eye of someone looking around.