Baghdad severed Iraqi Kurdistan's air links to the outside world in late September after it voted overwhelmingly for independence at a non-binding referendum rejected as illegal by the central government.
The flight ban was just part of a battery of punishment inflicted on the Kurds as Baghdad sought to nullify the poll, with federal forces also seizing disputed oil-rich regions in a major blow for their finances.
Talar Faiq Saleh, the director of the airport in Iraqi Kurdistan's capital Arbil, said the transport ministry in Baghdad had sent a message signalling that international flights were "banned until February 28".
The two-month extension sees Baghdad keeping up the pressure on Iraqi Kurdistan as the fallout from the failed independence push has battered its economy.
A spate of angry protests that have seen the offices of political parties torched in a string of towns has rocked the region this month.
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