Belfast 'to benefit from Heathrow growth'
Belfast International Airport has been named as one of six regional destinations which will be served by an extended Heathrow.
The Department for Transport said it expects Belfast International, Liverpool, Newquay, Humberside, Prestwick and Durham Tees Valley to be added to the west London hub's domestic network by 2030.
The measures are included in a draft national policy statement setting out why Heathrow expansion is the Government's preferred option for boosting airport capacity in south-east England.
The Department for Transport urged Heathrow to work "constructively" with airlines to increase domestic routes.
Ann McGregor, chief executive of the Northern Ireland Chamber of Commerce and Industry, said: "We welcome any expansion plans at airports which have relevance for Northern Ireland and boost the connectivity of the region with other areas in the UK and beyond.
"Undoubtedly, the expansion at Heathrow will result in an increase in the frequency of flights between Belfast City and Heathrow and new links from Belfast International and this will be of major benefit to the Northern Ireland economy."
EasyJet has indicated it will add a Belfast International to Heathrow route in the event of expansion at the London hub.