Most airlines are expected to be operating near normal services today for the first time since the weekend although more ash from a Chilean volcano may be heading our way.
All Air New Zealand's domestic and trans-Tasman flights have resumed, except those to and from Queenstown, where flights remain grounded until midday. An update for the flights is expected later this morning.
Pacific Blue announced today it would resume services from Auckland to Melbourne, Sydney and Brisbane, and Samoa.
The company is still reviewing other trans-Tasman services.
For the first time in nearly a week, Qantas will resume some of its services to New Zealand from Australia.
The airline said it would resume most flights to Auckland, Wellington and Queenstown.
Jetstar said last night would also resume some of its trans-Tasman and New Zealand domestic flights today.
Experts monitoring the volcano say disruptions to air travel by the ash could last for months.
Puyehue-Cordon Caulle began erupting in June 4 and volcanologists say its size and history indicate it could remain volatile for weeks.
Chile's National Service of Geology and Mining director flew over the volcano this week and told local newspapers it showed similar signs of activity to an eruption in 1960, which lasted for two months.
GNS Science volcanic geologist Graham Leonard, who is analysing the data, said there was no guarantee of how long the ash plumes would last.
"But the overall character of this volcano -- its personality -- is capable of producing drawn-out eruptions.
"Nobody is forecasting an immediate stop to any activity. Just the fact that it is a large, pyroclastic [explosive] eruption -- these things are typically capable of going on for at least weeks, if not months."
Meanwhile, New Zealand Post said there could be continue to be disruptions to mail service.
In some areas, it was transporting items by road rather than air, which could cause delays.
MetService, which had been providing the ash forecast on behalf of the Civil Aviation Authority (CAA) to airlines, said as long as there was detectable ash it would continue monitoring the situation.
