What is the main crisis confronting global airline executives at the IATA summit in Rio de Janeiro?

The main crisis is the 'Iran war fuel shock'—surging jet fuel costs, flight detours due to Middle Eastern airspace disruptions, aircraft delivery delays, and mounting pressure on airlines' ability to raise fares and maintain profitability, described as the industry's biggest crisis since the pandemic.

How has the Iran war specifically affected global air travel and airline operations according to the article?

The Iran war has driven up jet fuel costs, forced flight detours—especially impacting Gulf carriers reliant on Dubai, Doha, and Abu Dhabi hubs—lengthened flight times, increased fuel burn, contributed to the first global passenger traffic contraction since the post-pandemic recovery (in April), and exposed vulnerabilities in the Gulf hub model; it has also compounded pressures on European carriers from closed Russian airspace and air traffic control issues, while creating opportunities for non-stop Asia–Europe carriers like Lufthansa Group and Singapore Airlines.