Often, probably even most of the time, cats have some kind of camouflage patternation on their top halves but their underside is white. This doesn't make sense for a terrestrial hunter, the only reason one would have a white underside is if they are flying in order to camouflage them against the sky if they are being looked at from below. So the ancestors of cats must have at one point been capable of flight but have sense lost this ability. You can say what you want but the evidence is there.
Also, there may be fellows that doubt this hypothesis based on a 'lack' of evidence and who are going on what the skeletal remains tell them BUT. If the wings were made of cartilage they would not be left for us to find after all of this time and being an aerial predator it would probably nest high up and live in the mountains and so maybe there remains would not be left intact up there or the bones would get blown away, plus we currently are lacking in the amount of archaeological digs that we do in places like that.
Additionally, cats can have incredibly large ranges Tigers can have ranges up to 4000km2 and they don't even have wings, if they had wings they would have larger ranges and so maybe they would be quite rare and it would be even harder to find remains.