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Crystalsong Forest(formerly), Alterac Mountains(formerly), Flying over the sea in motion (actually). Dalaran (aka Dalaran City) is a magocratic city-state which was once located by the Lordamere Lake on the Alterac Mountains shore in the Eastern Kingdoms.
The planet with the survivors you're looking is named Oltan. Oltan is in the Phontes System which, in turn, is in the Silean Nebula. As for where Dekuuna is, it's the big planet right next door to Oltan. Once you scan Oltan and pick up the Elcor Flotilla, just head back to the Citadel Embassies and talk to the Elcor Ambassador again to finish the quest.