Errr...I don't recall any federal government announcement regarding the landing of MORE illegal immigrants at Cocos islands!
That because their not. The asylum-seekers were the ones aboard the boat that ran out of fuel off Cocos. They were taken to the island to feed and clean them up after 5 of their buddys went missing when the tried to swim (300km) for help.
The charter was to take them to the Christmas Island detention centre.
My first thought was Strategics 320, but I didnt think they had rear stairs (or fron stairs for that matter).