Fleeting notes are there for capturing ideas quickly while you are busy doing something else. When you are in a conversation, listening to a lecture, hear something noteworthy or an idea pops into your mind while you are running errands, a quick note is the best you can do without interrupting what you are in the middle of doing.
think about why I'm writing it. am I just getting it out of my head so I can continue focusing? is it more of a task? might be fleeting. you might be able to turn them in to permanent notes depending on how complete they are.
