Mr Walsh also blamed politicians for being "afraid" of tackling the issue of airport capacity.
He said: "I think it is fear on the part of politicians. They are afraid to tackle tough issues.
"It (expansion) has been kicked into the long grass and I think it will be sitting there for a considerable time."
He envisaged that there would still be only two runways operating at Heathrow even as late as 2050:
"New runway capacity is required, but I don't believe that capacity will be provided....This issue is too difficult for politicians and governments to deal with. We are positioning our business on the basis that there will be no expansion," he added.
More top news
On a visit to the Olympic Park, Brazilian footballing legend Pele took the time to talk about the Olympics and England's Euro 2016 demise.
Singer Rita Ora has been hospitalised after reportedly suffering from exhaustion just hours after the man who burgled her home was jailed.
The Hollywood star took residents in Merton by surprise when he touched down in a helicopter near Poplar Road.