Discounted economy airfares have risen the most, but there is still strong demand for them.  What does this suggest about the price elasticity of demand (PED) for these fares, the slope of the demand curve for these fares, and the impact on airline revenue?

https://www.9news.com.au/national/accc-to-watch-virgin-qantas-rex-airlines-as-cost-of-domestic-flights-soar-while-supply-is-low/29b9eac5-e634-41c1-a4bf-ab1de2bfe05e