I will have to say that Continental Circus may be the name of the airship. Here is an ad from a store:
From Final Fantasy Mechanical Arts line, this is a perfect die cast replica of the airship, Continental Circus! Made by Kotobukiya of Japan, this piece includes metal and plastic parts, amazing detail work, and stunning paint jobs
Toys N Joys Online - Final Fantasy X Toys

Also ebay describes it as such: Manufacturer: Kotobukiya / Play Arts
eBay.co.uk: FINAL FANTASY Mechanical Arts CONTINENTAL CIRCUS FFX (item 280101071452 end time 02-Jul-07 14:41:04 BST)