I found this out accidently. This could be useful for a quick boost of XP if you're leveling an alt. It also offers 350 rep with Orgrimmar.
Complete the quests in Stonetalon Mountains until you are offered the quest In Defense of Krom'gar Fortress - Quest - World of Warcraft from Chief Blastgineer Bombgutz. Seek and Destroy is a daily quest: Seek and Destroy - Quest - World of Warcraft
In this quest, you use cannons to shoot down gnome flying machines / gnome wing commanders. If you have 'In Defense of Krom'gar Fortress' and do 'Seek and Destroy' at the same time, the mobs count towards the Seek and Destroy quest. Thus, offering a fast completion for the Seek and Destroy daily quest for alts.
I'm guessing that you can hold onto the quest 'In Defense of Kromgar Fortress' and keep doing Seek and Destroy everyday as long as you don't hand 'In Defense of Kromgar Fortress' in. I know it isn't amazing XP, but it could be helpful for those who don't play WoW much. Also helpful for rep with Orgrimmar.