LinksAir will operate four flights daily between Monday and Friday along with two services on a Sunday to Doncaster-Sheffield Airport starting on 11 April.The route was previously operated by Flybe until 2011.Enterprise, Trade and Investment Minister Arlene Foster welcomed the announcement.She said: "The re-establishment of the air link between Belfast and Sheffield is great news for Northern Ireland."It not only strengthens our own access to the north of England and the greater east midlands, but also makes it easier for people to get to Northern Ireland for business or a holiday."Belfast City Airport transported over 2.5m passengers in 2013, making it one of the busiest years in its history, and I look forward to working with the airport and its airline partners as we welcome more visitors to the region throughout 2014."The announcement was also welcomed by Tourism Ireland chief executive Niall Gibbons.He added: "This will certainly expand travel options for holidaymakers in the north of England who wish to visit Northern Ireland."As an island destination, the importance of convenient, direct flights cannot be overstated, we know there is a proven direct correlation between access and growth in visitor numbers."We look forward to co-operating with LinksAir and George Best Belfast City Airport, to maximise the promotion of this new service."LinksAir said the opening of the route could lead to further expansion of its services in Belfast.Roger Hage from the company added: "Belfast is an exciting, vibrant city to visit and connectivity to Northern Ireland is increasingly important for Sheffield."