"Air New Zealand will be concerned that Jetstar could potentially come to Tauranga. By pro-actively lowering prices and increasing seats they are securing the market."
Mr Clout said introducing more of the 68-seat turbo props was good news for Tauranga.
Driving times between Auckland and Tauranga were becoming slower and the new aircraft would make it more attractive to fly between the two cities.
"It will be a great boost for travellers, particularly business travellers."
Air New Zealand chief executive Christopher Luxon said the addition of 600,000 more seats on regional services would lower fares. Bigger planes were cheaper to run per seat and this allowed the airline flexibility to cut fares.
Tauranga Airport manager Ray Dumble said it looked like the new planes would replace the 50-seat Bombardier Q300 Dash 8 morning and evening services.
He was confident the extra seats would be filled. "It will be great for business travellers, and leisure travellers as well."
The 15 new planes will replace 11 older aircraft and fly on existing routes, with no plans to restore the Whakatane service axed last year.
Mr Luxon said the announcement was not in response to Jetstar's regional operation and Air New Zealand would fly where there was most demand.
In addition to ATR aircraft, Air New Zealand also operated 10 19-seat Beech 1900Ds - which it is phasing out - and 23 Bombardier Q300s.