Vanair is Vanuatu's domestic airline and has 2 (sometimes 3) roundtrip flights each day from Port Vila to Tanna Airport.
The aircraft is one of those small, propeller driven aircrafts and the flight takes about an hour.
The locals usually pile into the back of a 4WD for travelling distances in Vanuatu... Not everyone has a car but usually someone in the village will have one at least. Everywhere you go you will find locals sitting or standing in the back of a 4WD...it isn't illegal over there.
If you intend to go to Port Resolution from the airport, I would highly recommend doing so immediately. I stayed in Lenakel overnight after arriving thinking it would be no problem getting to the eastern side of the island in the morning, and ended up waiting an entire day for a lift. I was very, very bored and there is really nothing to do in the city of Lenakel.
Tanna is a wild and remote place. To say the roads were a "little rough" would be a huge understatement!
Getting from Point A to Point B can be a hair-raising experience!!
Definitely a 4WD vehicle is the best and safest way to get around the island. It's the best way to get a close up glimpse of the mountainous interior and the lush vegetation.
And ohhhhhh......the potholes!!! The paved roads are full of 'em.
We spent the day cruising around a 4WD vehicle which was arranged by our hotel. It made getting through those normally "impassable" roads a breeze!
Look down onto the island from the airplane window and you will see a vast area of lush greenery and ocean blue. For a split second, you wonder if there is any civilization on this island.
The Whitegrass Airport is a tiny airport in the middle of a deserted field. Upon arrival, it would always be best to arrange your transportation to your hotel/guest house beforehand.
(No taxis waiting curbside on Tanna Island!)
Van Air flies from Efate to Tanna each day. They have a few smaller planes, including the 20 seater that we went on. It was a bit of a squeeze but they managed to get us all on. :)
We took a 4WD with a cage on the back to Mt Yasur. It was a long trip from one side of the island to the other (although the island is only 15 kilometres wide). The roads are very rough and steep in parts so the trip is very slow. The views from the back of the truck are great though. :)