The International Airport Transport Association (IATA) said the expected net profit is more than USD 34.5 billion projected for this year. The figure for 2017 was revised upwards from USD 31.4 billion forecast in June.
Strong demand, efficiency and reduced interest payments would help airlines improve net profitability in 2018 despite rising costs.
"2018 is expected to be the fourth consecutive year of sustainable profits with a return on invested capital (9.4 per cent) exceeding the industry's average cost of capital (7.4 per cent)," IATA said in its 'State of the Industry and Global Economic Outlook' report.
Overall revenues are also forecast to climb to USD 824 billion next year, from USD 754 billion seen in 2017.
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Reflecting strong demand, the worldwide air passenger numbers are expected to cross 4 billion this year and grow further to 4.3 billion in 2018.
"Next year, the average world citizen will travel once every 21 months. Back in 1996, the average citizen flew just once every 50 months and in 2000, every 43 months," it said.
In the Asia-Pacific region, including India, airlines are expected to register profits of USD 9 billion in 2018, which would be marginally higher than USD 8.3 billion projected for this year.
India is one of the fastest growing aviation markets in the world, registering high double-digit growth for more than two years.
IATA Director General and CEO Alexandre de Juniac said it is good times for the global air transport industry and airlines are achieving sustainable levels of profitability.
"It is still, however, a tough business, and we are being challenged on the cost front by rising fuel, labour and infrastructure expenses," he said.
Further, Juniac said the forecast of record net profit of USD 38.4 billion for the next year is still USD 10 billion shy of the profit that Apple announced for 2016.
"Per passenger, airlines on average will make less than USD 9 and the net margin of 4.7 per cent is hard won," he added.
IATA represents around 275 airlines comprising 83 per cent of global air traffic.