Y1BD - CONSTRUCTION OF AIRPORT RUNWAYS AND TAXIWAYS
Y1GD - CONSTRUCTION OF OPEN STORAGE FACILITIES
Y1LA - CONSTRUCTION OF AIRPORT SERVICE ROADS
Y1LZ - CONSTRUCTION OF PARKING FACILITIES
Y1ND - CONSTRUCTION OF SEWAGE AND WASTE FACILITIES
Y1NE - CONSTRUCTION OF WATER SUPPLY FACILITIES
Y1NZ - CONSTRUCTION OF OTHER UTILITIES
Y1PA - CONSTRUCTION OF RECREATION FACILITIES (NON-BUILDING)
Y1PB - CONSTRUCTION OF EXHIBIT DESIGN (NON-BUILDING)