Abel said Thor Elliott of Fremantle Ports and Jay McKenzie of Bob Wood Cruise Group had completed their terms.
They were replaced by Matthew Carley (Port of Brisbane) and Karlie Cavanagh (Inchcape Shipping Services).
Scott Lovett (Tourism Northern Territory) and Martin Bidgood (Intercruises) were re-appointed.
Other members of the new committee are Anne McVilly (Port Arthur Historic Site) and Christine Cole (Tourism Western Australia).
Abel remains CEO and Grant Gilfillan remains as chairman.
As previously reported, ACA 2020 will be held in Townsville September 9-11.