How to create a new trade unit

Bangra 7

The Port Of Call
Joined
Aug 28, 2008
Messages
225
Location
Raleigh, North Carolina
So, as simple as it may seem, I am wondering how to create a new unique trade unit that can be built in the modern era, but isn't a galley, cargo ship, or a caravan. Specifically, I want to use a model I found on here of a boeing 747, and my oceanliners, to trade culture, gold and science across international borders. Any ideas on how this can be done?
 
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