You have a similar situation in Adelaide when entering the international departure area from the domestic side.
Originally Posted by
nivsy
Still begs the question though, a flight is a flight regardless of international or domestic so why the different liquid requirements?
Many countries require that any inbound flight has to be checked for liquids. So while Australia can decide that the risk domestically is low, some of the countries on the receiving end require additional checks. You get odd examples here and there. If you fly QF from BKK to SYD, you will be subject to a separate manual check of your carry on before boarding in addition to the standard security screening. If you land from the US for example in MUC, you can often transfer to another flight without having to clear security again.