The Middle East's largest airline keeps expanding to meet the ambitions of Dubai which aspires to cement its status as a major travel hub, he told AFP.
"I don't think Emirates is going to stop with this order," he said, referring to purchases announced at Dubai Airshow yesterday.
These included a commitment to buy 150 Boeing 777X long-range airliners and a firm order for 50 Airbus A380 superjumbos.
The order from Boeing is valued at USD 55.6 billion, excluding engines, while the purchase from its European rival Airbus amounts to USD 20 billion at list price.
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Dubai has in the past announced ambitions to turn Al-Maktoum into the world's largest aviation hub once completed, with five runways and a capacity to handle 160 million passengers annually.
"They're hoping to get that in the state of readiness for 2020-2022, and the scale of that will allow us to grow our fleet further," said Clark.
"When we have more firm time lines on that, we will be revisiting our fleet plans and routes structures."
Dubai International is already one of the world's busiest hubs for international travel, handling nearly 58 million passengers last year.
Clark said the carrier's commitment to buy 150 Boeing aircraft would be finalised before the end of 2013. "The contract will be finalised by the end of December, so six weeks away... What we did was sign a commitment letter which will lead to a contract very shortly," he said.
Emirates was in discussions for four to five years with Boeing over the new Triple Seven airliner scheduled to enter service around 2020.
Business at the biennial Dubai Airshow got off to a bright start.
Yesterday's opening day saw orders from the big three Gulf carriers -- Emirates, Etihad Airways and Qatar Airways -- for Boeing and Airbus planes hitting USD 141.5 billion, excluding the price of engines.