The armrest of the aisle seat might seem like it can't be raised, but appearances can be deceiving. Many aisle seats have a hidden button or lever that will let you raise the armrest.
Photo by theogeo.
This tip comes to us via Reddit user Goat_Porker, who says this can come in handy if you want to spread out more, although some flight attendants might tell you to lower it back. Broken Secrets' Chad Upton also adds this will also make it easier to get out of the seat:
a few years ago, I saw a person in the row ahead of me raise the aisle armrest. That was a game changer for me. No more ducking! Simply raise the armrest, then stand up while you slide off your seat into the aisle. There are a few planes that do not have movable aisle armrests. However, most of them have a small lever or button on the underside of the armrest, near the hinge. Pushing or sliding this lever will release the hinge lock, allowing you to raise the armrest.
So maybe you can be a bit more comfortable on your next cramped flight.
The Hidden Lever to Raise Aeroplane Armrests [Broken Secrets]