1. For further information about the data, including updates or changes, see the Explanatory Notes section of this issue and the related Appendices such as Data Quality Issues.
2. Short-term arrival movements are based on a sample and are subject to sampling error. See paragraphs 10 and 11 of the Explanatory Notes section of this issue.
3. Occasionally situations occur that necessitate breaks being applied to the trend series. For an overview of the breaks currently included in the trend series, see paragraph 29 of the Explanatory Notes section of this issue.
4. Investigations by the ABS have determined that there were some changes in the distribution of responses to the question on main reason for travel from July 2017 as a result of changes in the layout of the incoming passenger card. For more information see Section 7 available in the Data Quality Issues (Data Quality Issues Appendix) in the Explanatory Notes section of this release.