Originally Posted by
Legend717
Window armrests are, as a general rule, not movable.
I'm sure there are exceptions. But when you get on a plane, by default, assume that the window armrest won't move.
As I recall, the window armrests on the port (single seat/A) side of the ERJ 135/145 can be raised. Not sure about the starboard side since it's been a long time since I sat in a 'C' seat on that aircraft type.