What if...? Writing Prompt.

What would happen if you could fly whenever you wanted? When would you use this ability?

If we are talking some kind of biological flight, where humans have acquired the ability to navigate in the air like birds or insects: 

When wouldn't I use this ability?! If I could fly whenever I wanted I don't think I would really walk much of anywhere. Maybe in buildings or if I was unable to hover or move slowly during flight. I imagine flying is a faster form of transportation so it would make my morning commute nicer.

I have some experience moving in three detentions thanks to my scuba diving background, and I think having that ability in air would be great!  

Of course we might be talking about flight that involves some kind of equipment, potently requiring fuel. I'm thinking jet packs! In this case safety might be more of a consideration if I choose to fly or not. 

Also to be considered is the number of other people that could fly. Is it a normal thing, or am I special? If only I can do it, powered or not, I might want to reserve it for special circumstances, like where someone's life needs saving, and I have to wear a costume so no one knows it's me.