Auckland Airport says it's had no shortage of interest in its $1.4 billion capital raise. 

It will use the money to drive down debt and upgrade the airport, runway, and other infrastructure dating back to the 1960s. 

The upgrade is expected to take about five years to complete. 

Auckland Airport Chief Executive Carrie Hurihanganui told Mike Hosking the capital raise had been signalled to the market. 

She says there's been a very positive response from institutional investors and will start seeking retail investors today. 

LISTEN ABOVE