If you want to use the SkyTrain, you need the Airborne Sailor/Marine for the corresponding nation. In HA, you fly the transport to one of 3 harbor zones (marked by a green circle) and drop the sailors. As long as it doesn't get shot down, the harbor loses DP, and it is captured when it reaches 0. In GB or Blitz, it is useless. It has a lot of DP, but is slow, so easy to shoot down.
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