This is a tactic everyone should consider in their games. Especially for the United Kingdom, or Nazi Germany when under Duress…
Several Seazone’s Have multiple territories that touch them. For example, Eire, Scotland, and London, all Service Sz109.
A new German strategy - is to pull a tradition british bypass, Threaten Sea-Lion, build a few subs for economic damage, and keep britain locked down on their island, relatively unable to make a navy to escape!
As you build one or two, or three ships at a time, the Gerries will use their subs and fgt’s to piece meal you off, trading subs for ships, or aircraft.
Building a second, or third Airbase, can allow you to essentially flood the zone with 6 or 9 aircraft for the rest of the game. You will always have a navy.
The same can be said for the Germans, if they are smart, and build a dst or two, mixed with airbase flooding. Consider this if you want to Stop or delay invasions into france and normandy. AB in Holland, or Normandy, Flood Sz110, and 112 can be serviced by Denmark, and Norway - ontop of West Germany. Not that the Nazi’s will have 9 planes necessary to field this defense, but with italian support it’s possible, and certainly an obstacle not to be trifled with.