Taking photos from the window seat on an airplane can be effortless or tricky. The primary objective is to make sure that you focus on something outside the plane. Now that may seem basic and even silly to mention, but depending on the medium you’re using … and just how clean the window is … it’s not hard for the auto focus to lock onto something very close.
Once the focus has been established (and of course a proper exposure), be mindful of your reflection or any other reflection off the window back into the plane’s cabin.
On a sunny day, look for glare or reflections off metallic surfaces of the airplane.
After that, cross your fingers and hope for smooth air!