Dubai , Abu Dhabi , Doha , Istanbul and Riyadh are all upgrading their main transport hubs . There is pressure in the region to build the most 'iconic ' airport . The combined capacity in the region will number 450 million -- three times current traffic . Comment:
Dubai , Abu Dhabi , Doha , Istanbul and Riyadh are all upgrading their main transport hubs . There is pressure in the region to build the most 'iconic ' airport . The combined capacity in the region will number 450 million -- three times current traffic . Istanbul and Dubai are both claiming their airports will be the world 's biggest .