Justin is quite reliable. Jimmy marked each point he mentioned on the map, and the distances between them are indeed as he said, completely manageable with a seaplane. However, from Miami out into the open sea, it's nearly a thousand kilometers to the Dominican Republic. There aren't many seaplanes capable of such a journey, as they're generally meant for short-haul takeoffs and landings.
He forgot to inquire about the plane model earlier, but since such a route can be arranged, it should be fine. Maybe they're using one of the few models suitable for long-distance transport.
The Dominican Republic is a rather unique country. Though it's not far from the United States' Puerto Rico and the Virgin Islands, traveling back and forth by plane or yacht is easy; dealing with checks and customs is troublesome.
