AMEC and Carillion are carrying out repair work at Manchester Airport after cracks began to appear in the surface of the taxiways.
The joint venture completed work on its £172 million contract to build a second runway at the airport in February 2001.
A Manchester Airport spokesman said: 'Some of the existing taxiway pavements have experienced cracking and have had to be patched up.
'The cracks have been appearing mainly on the taxiway between the two runways at the airport in a small minority of the surface area. The work is being dealt with by Amec and Carillion on an inspection and maintenance basis, part of their or iginal cont ract.'
The 3 km runway has a layer of asphalt on the surface to ensure a smooth landing. But the taxiways are coated with a different pavement-quality concrete - better able to absorb fuel spillages.
A spokesman for the joint venture said: 'The spalling at the top edges of some of the concrete taxiway pavements affects only a very small number of slabs. We are in discussions with the clients over the causes and solutions.'