Hey guys - Fellow AIR developer (we should seriously all get in Discord together) and I just wanted to weigh in on my experience with this as well. I can confirm that Daniel's solution works with the new iPad Air 11" model. Originally, I was getting the black border around the entire app, now it's true full screen. I also tried removing all of the static PNGs (ex: Default-Landscape@2x.png) and it appears that when storyboard is used, these are no longer necessary. My application initially boots from a native Flash display (all vector graphic) and it loads very fast, so I just made my LaunchScreen.storyboard transparent and disabled all the transition options. This results in an instant boot-up to my Flash vector launch screen on iPad Pro 11inch. On my first gen iPad Air, there's a brief pause on a black screen, then it goes straight into the vector Flash launch screen without any transition. Interestingly, if I then close the app (by swiping up) and reboot it, it will then launch instantly to the vector flash screen, then have a black screen appear over that which fades into the Flash vector screen. Perhaps this is the default Adobe loader others are experiencing?
In either case, I can't imagine Apple rejecting an app for not having a launch screen, as Apple's own native apps have a brief delay on all-white screen backgrounds (ex: Photos) when you cold-boot them on older iOS devices.
Thanks so much for the solutions discussed here. It's not apparent at all in any other workflow documentation how to properly initialize the storyboard - and this change makes it so much easier to handle newer iOS devices. Curious - is there a way to provide a vector app icon and have Apple automatically produce all appropriate icons in the Assets.car?