So how fast are you going up there? Were you assuming you'd get super speed to go along with your flight? OK. Have you seen what a bird can do to a jet engine at high speed? Imagine what it does to your face. Yeah, that's why anything going faster than a hang glider has a windshield up there.
But if instead just you're flying at about the same speed you run, then, well, you're like that old couple that drives 25 on the interstate. The crime will be long over by the time your slow ass gets there.
But let's say you did get some kind of speed boost, and a bird-proof face. Do you know where you're going? Up there in the wild blue yonder, without landmarks, how do you expect to navigate? Do you have an exact map of the entire country in your head? Sure, you can find the Empire State building if that's where the bad guys are, but what if the crime is happening in some house way the **** out in the middle of nowhere, amid a tangle of looping country roads?
OK, so you get some kind of radar installed in your head. But now you have the atmosphere to deal with. Wind constantly blowing particles into your eyes and the freezing cold. Granted, you'd have to go up pretty high to get that effect, but you're not going to be a moron and fly where people can see you.
Oh, by the way, you might want to be careful what you wear. Not only is it cold enough to freeze your balls, but lower temperatures mean you're more of a conductor of electricity. It's like when you're walking home on a winter day, come in and shock the **** out of whatever you touch. Multiply that by say, a million. If you're wearing anything like wool--though we don't know what the Hell kind of superhero would wear wool anyway--you're going to be a human capacitor. If you happen to be a supervillain, we suggest working on your Palpatine voice so you can make one Hell of an entrance when you land.