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.
(..) And I can't do my job and babysit. Stay in here, you're good, I'll send your brother to come find you, but if you step out that door, you are an Avenger. All right, good chat. Yeah, the city is flying. I got you! Just look at me. You can't save them all. You'll never... (..)2015 Avengers: Age of Ultron
(..) This is all our fault. Hey, look at me. It's your fault, it's everyone's fault, who cares. Are you up for this? Are you? Look, I just need to know, 'cause the city i-, is flying. Okay, look, the city is flying, we're fighting an army of robots, and I have a bow and arrow. None of this makes sense. (..)2015 Avengers: Age of Ultron