Air New Zealand (NZE:AIR, ASX:AIZ) group capacity rose 2.4% year on year in April, according to a Tuesday filing with the Australian and New Zealand bourses.

Long-haul available seat kilometers (ASKs) rose 0.3%, while domestic ASKs increased by 2.2%, per the filing.

Short-haul international ASKs rose 6.9% year on year, supported by the addition of two new A321 aircraft.

Group year-to-date underlying revenue per available seat kilometer rose 2.8% from the prior year.

The airline carried 1.3 million passengers in April, up 2.2% from the previous year, while the passenger load factor rose to nearly 86%, up from around 84%, the filing added.

The company's New Zealand shares were down 2% in recent Tuesday trade.