Delta Whiskey
We have a system like that over here, we call it "cross-coupling". Be ware! The technical nature of crosscouple systems can lead to suppression of transmissions if they occur at the same time.
A recent incident at Manchester was caused by this when two aircraft responded to the same instruction. The incorrect one, starting after and finishing before the correct one caused the system to supress it. As a result the use of crosscoupling has been suspended and that is likely to spread to the rest of the UK.
Point 4
