Use of courtesy channel as early as in the week of 21/5 (I flew on 23/5 and was told that they just started offering that few days ago). But not much people in the normal channels so didn't use that. Buggy, as usual, needs to wait for 10 mins so I just take the ATM as usual
Courtesy channel can take guest but buggy as usual is for one person only. Also, the buggy can take you to anywhere you can go in T1 as you like