What is the fine-grained topic of the following text: ATR also added orders for two more ATR72-600s from Air Tahiti (VT, Papeete) bringing its total to six; one order from Air New Zealand (NZ, Auckland Int’l) subsidiary Mount Cook Airline (NM, Christchurch) which brings its total to nine, and one order from Maldives carrier FlyMe. Only return the topic.
Airplane orders and purchases by various airlines