Travel Between Pacific Island Countries

I'd like to spend a month travelling to several different Pacific Island counties, say : Samoa, Tonga, Fiji, Vanuatu & Cook Islands.
Is it possible to travel direct between these countries, or do you have to fly back to New Zealand to travel to the next destination ?

(I'll post this to several of the counties forums)

here';s the results for Tonga's Fua'amotu:

http://www.tongaairports.com/flight-schedules/international/

I think Chathams fgo to Niue.

From Cook Islands you can only fly to NZ, Tahiti or LA. We used to have direct flights to Fiji, but don't anymore.. Between July - Oct this year there will be a trial of direct flights between Rarotonga and Sydney.