There is maybe a 10% chance of seeing one in the America-to-Britain convoys, 1940-1942. I've dropped a couple of them in my first 20 patrols, or so.
Much higher probability down towards Trinidad and the Caribbean, but they will be singles and moving p-r-e-t-t-y darn fast. In fact, you could probably find liners by how fast they are moving; any single that is moving "hauling ass" speed (20kts), that's libel to be one.
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