Sources said there was fuel spillage from the right wing of the aircraft at 4.35 PM yesterday when it was taxiing for take off.
A fire engine was pressed into service and a substitute plane was arranged and the flight took off two hours later at 6.15 PM and landed at Thiruvananthpuram at 9.26 PM.
According to airport sources, the airline reported only a 'wing tank overflow' at first and later acknowledged oil spillage.
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