FerretyBeast on Ascentemu took the initiative to spawn portals to each city where the zepplins would be. On most ascent revisions, the zepplins dont work, so this is a nice addition for servers.
You can download the file here: http://filebin.ca/tztgbn/ZepplinPortals.sql
Please note i did not make this, and got permission from the owner to post it here. Thank you 
Code:
#Custom Zepplin Portals
#Last Update 29th December 2007
#Original credit goes to ferretybeast on ascentemu. Gastric got permission to post :P
#These portals will be placed on each zeppling pedistal, seeing as though zep's dont work.