ACCC findings: Airport ups and downs April 30, 2013 - 9:54AM What the ACCC found in its report on Australian airports. Winner: Brisbane was rated highest for overall quality of service Losers: Sydney was lowest rated overall for quality of service, followed by Perth Aeronautical investment at Adelaide, Brisbane, Melbourne, Perth, Sydney: $547.4 million (up from $339.5 million in 2010-11) Busiest: Sydney (36.3 million passengers) Slowest: Adelaide (7.1 million passengers) Priciest hour-long parking spot: Sydney ($16) Cheapest hour-long parking spot: Adelaide ($4) Source: Australian Competition and Consumer Commission