On Wednesday, Heathrow chief executive Thomas Woldbye will give a speech at British Steel's Scunthorpe plant and sign the UK Steel Charter – an agreement to use the company's steel in its new infrastructure.
Sir Nic Dakin, MP for Scunthorpe, said: "It is good news for Scunthorpe. It's a vote of confidence for Scunthorpe steel by a large UK company. We can take some comfort from that."
He told BBC Radio Humberside: "There are still very sensitive, difficult things to get through but there's no reason we can't get to the end of that in a positive way."
Sir Nic said he thought both British Steel and the government "want to find a way of delivering a very complex deal for the transformation of the industry" and added: "Whilst they are still talking that through, we should be hopeful about that being delivered."
Fellow MP Martin Vickers, who represents Brigg and Immingham, said: "As many of my constituents will work at the British Steel site in Scunthorpe, or will have family or friends working there, this will be welcome news across my constituency.
"I am also pleased that Heathrow have specifically chosen the British Steel site to make a landmark announcement on the upgrading and modernising of the UK's hub airport."
Mr Woldbye is expected to use his speech to unveil plans about increasing capacity at terminals two and five, reconfigure the airfield and improve bus connections with the airport.
It comes following recent government backing for a third runway at the London airport.
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