I've been a leech for a while, without much of anything to post. But here goes contributing!
It was a couple days before 5.4.7 that I happened to be in Silvermoon City, and noticed that my Falling Flame wasn't greyed out like it used to be. So I clicked it--And go figure, it was working in this no fly zone. And even after 5.4.7, I've discovered that it's still working in Ghostlands and Silvermoon City.
The item (For those who don't know) is: Falling Flame - Item - World of Warcraft
I made a short video of me trying this right before Thalassian Pass in Ghostlands, today. It worked just fine, and with my Goblin Glider I discovered there's no real land past the pass, though I could get to some rather steep terrain in the distance. I was also met with a 'Transfer Aborted - Instance not found' while out here, but no instant disconnects. Perhaps some more skilled explorers will find something neat out there, as I didn't spend too long looking.