Access the BITRE ‘Top Routes’ worksheet https://bitre.gov.au/statistics/aviation/do mestic.aspx 
Using data from this worksheet, analyse the development of the Australian domestic market from 2004-2018. Look for regional differences, and consider the type of passengers travelling on each route. You can limit your analysis to the following city pairs 
SYD-MEL, SYD-BNE, SYD-CNS, SYD-PER, SYD-CBR. SYD-OOL 
You may find it useful to expand your analysis with GDP data and population data available from ABS. and other reputable sources.