I've been looking for over an hour and just wandering every door/arch/tunnel hunting area, but I can't find the portal or the firebird itself. Any help? :(

Auchand, via Jainna, was kind enough to look into the matter for me and found there were some issues with the Firebird landing correctly in Zul'Logoth. There is a new portal in the middle of town now, and the ship should land correctly in town now (whereever that is)