Rotorua Airport chairman Peter Stubbs said the board was extremely saddened by Ms Brewer's resignation, but fully supportive of her decision.
"Nicole literally hit the ground running at Rotorua Airport and has achieved a great deal in this time, including seeing a significant increase in capacity on the Auckland-Rotorua route, as well as commencing necessary redevelopment plans.
"It is an exciting time for the Airport - and Rotorua - and it is a real shame that she won't be with us to see this through. But we are delighted for her and completely understand her decision.
Ms Brewer is expected to finish in November. Her job is being advertised now.