Municipalities that lie beneath a path used b y airplanes to and from the Greater Pittsburgh International Airport will be required to adopt a zoning overlay district that will identify the flight paths and restrict building in those areas.

Avalon became the first municipalities to approve creation of the new zoning district in a unanimous vote by the borough council Tuesday night.

Borough manager Harry Dilmore said that Allegheny County will reimburse municipalities 90 percent of the cost of amending their zoning codes.