My Apologizes if this is a repost, but I did find this out myself though !
So... Basically what you do is:
1. Fly around Dalaran to Silver Enclave/Sunreaver's Sanctuary.
2.Go as on pic 1
3. Fly to Dalaran (Silver Enclave/Sunreaver's Sanctuary.)
4. Why this works ? Because when you fly to Silver Enclave/Sunreaver's Sanctuary, it changes the zone to Silver Enclave/Sunreaver's Sanctuary instead of Dalaran.
Pic 1
Pic 2