Connected from Alaska T-6 to T-4 then on to Qantas this week...it seems far faster now to just walk from T6 =>T5 => T4, then waiting for the shuttle bus. The goofy thing is at T4 you have to take a elevator up to the T-4 concourse. It was unmarked when I went through, but there was a very bored security guard who told me where to go. Still had to take the shuttle to QF Gates in the ITB, but it seemed easier than taking 2 different shuttles. Also - if Alaska doesnt issue you a QF boarding pass, there is a Qantas rep at the shuttle in T4 that will print it for you -- no need to leave the secure area.