I booked a round trip flight from Invercargill to Stewart Island. The flight to the Island was aborted due to fog and then revised after turning around and flying back. While that was exciting it was a warning that planes without instrumentation cannot land on small airstrips.
The day before we were to go back the flights were delayed. I asked what happens if a flight is canceled. The answer is that they will book you on the ferry. This is good except that there are only three ferries, 8AM, 3 PM and 5 PM. I had a flight leaving Invercargill at 3 and a flight from Stewart Island at 1:30. If the fligit I delayed or canceled they will put you on the next ferry, which is 3. This of course means you miss the flight to Auckland. So if you are going to make this trip you best buy the flexi fare, which are the more expensive. We had not so we purchased ferry tickets on the 8 AM boat to ensure we would be able to fly out. Not the best method at it was quite expensive. Stewart island flights do not reimburse.

This is real flying. Plane only holds 8, twin propeller engines.
Loved it
I flew to Mason's Bay and we landed on the beach / totally awesome!

We booked the flight instead of the ferry as it is much quicker, gives aerial views and is not far out in price.
It was a great experience flying over.
A bit of fun that they weigh the passengers as well as the luggage - but you can tell why when you consider the size of the plane.

We left our heavy luggage in their store at Invercargill.

On the way back, unfortunately, the weather was too bad to fly, so we were transferred to the ferry. Didn't really mind as we were not in a hurry and it gave us the experience of both routes.

However, the problem arose with the luggage left in Invercargill.
We were, of course, a lot later than we would have been by plane and, despite being told there would be someone there, everyone had gone home. Not ideal. Someone else in the group of passengers had even been picking up a rental car key from them - so couldn't.
Fortunately a different pilot with the company happened to come in and was able to sort us out - but that was by luck, not design.

I hope they have now sorted things out so this doesn't happen again - but just bear this possibility in mind when you leave things in their office.