A flag 'flies' in front of the building. = There is a flag 'flying' in front of the building.
The restaurant 'made a flying start' by filling up on opening night.
After some difficult years, the company is 'flying high' again.
(..) I don't even know what it is. So what's it like having people find themselves... ...in your office all day long? Does it get messy with all those feelings flying around? Why, does that make you uncomfortable? - No, no, no. - No? No, no, no. No, I'm not on your couch. (..)2006 The Departed