Upvote:3
It will be something like the image pictured below, the video screen will come out on an arm from the front of the seat. The tray table will come out from the middle arm rest folded in two.
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Upvote:4
In the first rows of economy, those tables fold out of the armrest. It is normally slightly wider than the armrests behind, and closed, to contain the folded table.
This works fine, unless your legs are much thicker than average, then it would not fit over them.