Construction and engineering group Costain has won two airport contracts, one at Manchester and the other at London Heathrow.The Manchester contract is worth £18.6m and is for the refurbishment of the airport's main runway, Runway 1.The Runway 1 project will continue through to September 2011 and the airport will remain operational 24 hours a day during the runway closures period by using the second runway.The Heathrow contract is expected to be worth £8m a year over a period of four years, and will see Costain installed as one of the suppliers for the Local Project Integrator at the UK's busiest airport.