N49 - as explained, if another a/c transmits in a gap, the incoming aircraft may NOT hear the clearance to land in which case it should normally go-around. Nobody wants this, so the controller 'keeps control' of the frequency by keeping it 'open'. Yes. again normally the clearance is read back but if it is so late that the wheels are almost touching...................
Surely, if you say 'Speedbird 123, cleared to land on runway 24, surface wind is calm', that's sufficient?
- is not this whole thread about the situation where the clearance to land CANNOT be given like that at the 'usual' time as the runway may still be 'occupied', so it is delayed?