Campaigners against the expansion of Heathrow Airport have been given permission to challenge a High Court ruling over plans for a third runway.
Councils, residents, environmental charities and the mayor of London brought four separate judicial reviews of the Government's decision to approve the plans.
The campaigners had their cases dismissed by two leading judges in May.
They were given the go-ahead to challenge that ruling on Monday.
During a two-week hearing in March they argued the plans wo