Aang's glider form Avatar the last Airbender?

i think that its possible but the wings could be hidden like Aangs and i don't think you could fly it. and there is not going to be a season 4 of avatar. could aang already mastered all 4 elements in book 3 and he also takes down the fire lord to nut i think they should make a mini season 4 tellling you what happened to zuko's mom.