It's possible to use all 737NG aircraft, the 737-600 for inter-island flights, 737-700 for inter-island flights to airports with more passengers, and 737-800 for US continent flights. The 737-800 I think is actually capable of flying from Hawaii to continental US destinations on the west coast like LAX and SFO, and it's even possible for a 737-800 HGW to fly from Honolulu to Tokyo, or another Japanese destination. You can even consider the same type of aircraft to fly from Honolulu to Mexico City, and 767 and 777s are great planes for European flights from Hawaii and some Asian routes with large passenger numbers, and from Hawaii to US intercontinental airports like JFK, LAX, or MIA