+ instances not really being deleted when 'terminated', so there's unnecessary clutter on your dashboard.
Ticket open since 2008: https://forums.aws.amazon.com/thread.jspa?threadID=26111&sta...
They also still count against your usage limit, so workflow gets interrupted and you have to wait till they are actually deleted, but you can't really be sure when that happens.
So have a coffee, check back, nope not gone.
Get another one, nope not gone.