My Cessna T206 has a 9:1 glide ratio, though I plan around 7:1 as I am not a factory rest pilot under ideal conditions. And nothing glides as good as a glider.

My Cessna T206 has a 9:1 glide ratio, though I plan around 7:1 as I am not a factory rest pilot under ideal conditions. And nothing glides as good as a glider. A 20:1 ratio is exceptional for any airplane, let alone a heavy airliner. To be fair though, I can safely land a Stationair on 700ft of dirt so my options are a bit better than a 787..