It's to reduce R/T traffic.
Under the "old" system:
1. You'd check in with London,
2. They would acknowledge and issue the STAR ( the arrival, which was almost inevitably the one you'd have on your flight plan and already loaded in the FMC).
3. You'd read back the STAR to ATC.
4. They'd confirm the readback was correct.
Under the current system:
1. You check in with London and tell them your flight planned STAR in one transmission.
2. They acknowledge with one transmission.
Last edited by wiggy; 1st January 2012 at 14:52.