Saudi Arabia launched its second national carrier Riyadh Air after more than a year of delays on Wednesday, defying the economic turmoil triggered by the Middle East war and strong competition from established Gulf airlines. A London-bound Boeing 787 Dreamliner in Riyadh Air's white and lavender livery took off at 2:30am (2330 GMT Tuesday), putting in motion a flagship project in Saudi Arabia's push to reduce its economic reliance on oil.