Airports could save money and drive down airfares by bringing domestic and international terminals together. 

A study has found integrated airport terminals save on double-ups and encourage passengers to spend more money. 

It shows this extra revenue could help airports cut costs for airlines, which could mean cheaper fares for travellers. 

NZ Airports Association CEO Billie Moore told Mike Hosking integration is the dream for all airports. 

She says it helps them build better, save on spending over time, and makes the passenger experience better.  

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