ladiszlai - That transport with SAI is called Zephyr and has 4 SAI scripts. All of them have event_type SMART_EVENT_GO_EVENT_INFORM and action_type SMART_ACTION_CALL_TIMED_ACTIONLIST. These actions activate another sets of smart_scripts (script sets 19054900, 19054901, 19054902, 19054903 in smart_scripts). Those script sets, for example, make the closest creature to gob with entry=34715 say something. It seems you have some sort of NPC guide onboard? Just check it out for yourself, follow refferences in smart_scripts.

Once again, transport is gameobject, taxi is mount. You can't make SAI actually spawn transport. You can make SAI call taxi path, which will lead into player being mounted on NPC and sent on taxi path. This has absolutely nothing to do with data0 and with gobs whatsoever. If you haven't already tryed to actually do what this tutorial for, I am not sure why are you even asking about things which might get obvious to you after trying to do this on your own.

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dumass - Make sure you have DBCs in your patch-4.mpq (or patch-[letter].mpq) and also in your server's .../dbc/ folder. Steff also said it is good to have patch with edited DBCs also in Locale directory (Data/EnGB/ or Data/EnUS/ or whatever else), I never had any need for that but... whatever. Also check if you really had created (correctly) gob for transport and that you have added it into transports table. I can't help you more, just do exactly as I said in tutorial and make sure that you did so. There are many reasons why it possibly doesn't work for you, so if you won't be able to find solution on your own, I will need to see your DBC and DB data you have added/edited. Just btw, you are not to spawn transport gob on your own. Server will take care of it on its own without you spawning anything, but needs to have gob in transports table in world database.