The Pacific Islands Air Services Agreement, or PIASA, is a regional agreement that will provide for a multi-lateral basis for liberalising air services between the Forum Island Countries (FICs). PIASA's main objective is to establish a framework for the gradual integration of aviation services of the Forum members in a way that is fully supportive of sustainable development of the Forum island countries. 

It was at the first Aviation Policy Meeting in 1998 that Forum Aviation Ministers identified two main issues as important for the region- the first being the problems created by the numerous bilateral air service agreements that are needed between member countries, and second, the need to adapt to the changing world situation with respect to globalisation and trade agreements. In 1999, Ministers noted that with regards to moves toward a single aviation market, it was agreed that drafting a FIC multilateral agreement be undertaken under the auspices of the Forum Secretariat so that member countries can fully consider its implications. 

Ministers, at their meeting in 2001, endorsed the principle of a single air services agreement among the FICs based on the proposed PIASA, and directed the Forum Secretariat to assist in the review process, facilitate negotiations between FICs, and examine mechanisms for integrating the proposed PIASA into the Pacific Island Country Trade Agreements (PICTA). 

The PIASA is driven by the need to allow air services and air transport to fully develop and become more efficient given the vast distances between the forum island countries, the relatively small market economies, and the expensive air travel costs. In doing so, PIASA aims to encourage reduced air travel costs in the region, and thus encourage an in flow of travel to the region, increasing tourism numbers. Other notable benefits include:

- Increased FIC airline access to air routes between FICs 
- Expansion and efficiency improvements for FIC airlines 
- Greater use of code sharing and alliances 
- Greater connectivity within the region to improve its attractiveness to tourists 
- Greater cargo options for exporters and importers, and 
- Cost savings to airlines which can be shared with service users 

The PIASA was prespented at the 2003 Forum for Leaders signing. To date there are ten (10) signatories - Cook Islands, Kiribati, Nauru, Niue, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu and Vanuatu - and six (6) ratifications - Cook Islands, Nauru, Niue, Samoa, Tonga and Vanuatu. PIASA requires six (6) ratifications and will enter into force 30 days after the sixth ratification or accession instrument has been deposited with the Pacific Islands Forum Secretariat. The Agreement will come into effect on 13th October 2007.