I do not know a thing about this feature, but logic suggest me that an airplane could potentially be sent if it is in range of a "valid spawn point" like: an Axis city in range of your contact's location or a KM airplane carrier in a similar position. I think this is the logic because I red somewhere (gwx related thread or gwx user manual) that in GWX airplanes and warships just do not spawn out-of-the-blue (for example when a HK group is sent against you if you are detected) but in enemy port/cities (I'm not sure about airplane carriers, but it does make sense, for me).
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