By Ross Kelly SYDNEY -(MarketWatch)- Sydney Airport booked a slight increase in third-quarter operating earnings Wednesday as a strong Australian dollar encouraged more outbound international travel. Earnings before interest, tax, depreciation and amortization for the three months to Sept. 30 edged up to A$200.6 million from A$200.0 million a year earlier. Majority shareholder MAp Group said the rise came despite challenges posed by concerted industrial action against Qantas Airways Ltd. (QAN.AU) and the grounding for more than a month of Tiger Airways Holdings Ltd.’s (J7X.SG) Australian fleet due to safety concerns. Domestic passenger volumes fell 2.2% as international volumes rose 3.4%. “Throughout the third quarter, international growth was boosted by strong performances from Asian markets including China, Malaysia and Indonesia, supported by solid Australian outbound travel,” said Kerrie Mather, the airport and also MAp’s chief executive officer. Mather said the outlook for capacity in the fourth quarter is expected to be more positive, owing to the introduction of additional capacity for the winter season in the Northern hemisphere. A stronger Australian dollar makes traveling overseas more appealing for locals, but can deter inbound tourism. Still, the fast development of some large Asian economies means more people in the region can afford to travel to Australia.