Of course. But that said I'm not sure about the C919's prospects to be used for AEW, and the CR929 isn't coming anytime soon... I doubt we'd be allowed to modify Boeing or Airbus aircraft for AEW or tanker missions within this decade either. Given the limited amount of Il-76 tanker and AEW variants we have in inventory, wouldn't the Y-20 serve as a good stop gap until we can find a more ideal airframe?In an ideal world, both the aew (and other electronics heavy variant) and tanker would use a narrower fuselage, devoid of weight penalties that come with reinforced structure that a transport plane needs... but that's not likely to happen anytime soon. And when it does, it might rather be in a form of a commercial airliner airframe.