Iata said share prices had been down 12.4 per cent on a year ago.
''The underperformance of airline shares relative to global equities over both periods reflects investor concerns about the impact of rising costs on airline financial performance.''
During October oil and jet fuel prices reach four-year highs during October and this week are still 8 per cent higher than at the same time last year.
Oil hit a peak of US$69 a barrel in early October.
Iata said across the industry net post tax profits were $1.2 billion lower in the third quarter of this year, compared to last year as margins shrank.
The gap between premium and economy cabin yields which started to widen in around the middle of last year has persisted in the latest monthly data.
Yield in premium cabins - which account for 5.1 per cent of traffic but nearly 30 per cent of revenue - are now 3 per cent higher than a year ago.
Capacity is also growing, up 5 per cent in September compared to a year ago, and demand is continuing to trend up at a slightly faster rate.