Flight Ability of Winged Dinosaurs

So, it occurred to me: if chickens (and some other birds) have wings but cannot fly, what reasons have we to believe that dinosaurs with wings could fly? I guess this question hasn't any radical implications, but was just something I started wondering about for no good reason.The kind of evidence we would need, I suppose, would be of such creatures living in high places that would not be easily reached by non-flying creatures. Perhaps a certain diet would prove something”flying birds eat fish, for example, while flightless birds do not. There are other potential evidences, but these are just some examples.Anyone know anything about this?
Thanks,
Jon (biological evolution, please) Edited by Gremled the Great, : No reason given.

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