Auckland Airport faces the challenge of keeping more than 20 million passengers a year moving through one of the biggest building sites in the country.

As it scrambles to keep up with unprecedented expansion in aviation, it needs to build ''The Airport of the Future'' for the additional 20 million passengers forecast to pass through it during the next 20 years.

It's been likened to ''making your bed while standing on it'' - operating an airport for 55,000 passengers a day while hundreds of workers are rebuilding it.

Auckland is the gateway for more than 80 per cent of the

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