I have constructed an air-launched rocket-plane, which launches from the mother ship (think X15 that launches from B52)
After separation I can switch between the ships just fine with [ ], but only as long as the distance between them is less than 20km.
After that, non-selected vessel vanishes from the map completely, like it never existed. It does not crash and remains functional, just vanishes along with the crew.
Is this a bug or missing feature?