The PC-12 has a 16:1 glide ratio.....at 17000' it can glide about 52 miles....roughly half the distance from SJU-SBH, and as you said, within easy glide to many of the islands along the way.....and yes, the pilot referred back to his emergency training and did a great job....Very safe airplane, My little Cherokees have only a 10:1 glide ....