Ok, I am going to step in here and point out that there is still an active and viable trade using Dhows between Southeast Asia and the Middle East/Africa as well as South Pacific island hopping trade.In general all the Trade starts or ends in a few Large terminals where Trans Oceanic Container ships load. Both operations are interconnected but are largely invisible to each other as they don't think in the same terms mostly. A 10,000+ J3 freighter Whose primary ports are 3 jumps away and the little Free Trader on a local cluster run just don't deal in the same goods. Even when they stop at the same world, A little Non Industrial resource world probably ships the bulk of its commodities on a quarterly or longer scheduled Big Ship, which also brings in the bulk of said worlds sustenance trade, while the little FreeTrader stops in with the little things, read luxuries and other little things that get missed on the big shipment. Not to forget the little trader also can do the needed but out of sync deliveries that the main ship can't.