How to kick flip, I have a problem!!!!!!!!!!!!!!!!?

Im trying to learn a kickflip, I can flip fine and all but when I flick , my foot touches the groung for a split second and then I land it, IS THERE A WAY TO KEEP MY BOTH FEETS IN THE AIR AFTER I FLICK???? DONT STAY STUFF LIKE OLLIE HIGHER... THXXX TO ANYONE THAT ANSWERS!!!!!!!!!!!