Their interisland fleet is all 30+ year old 737-200's.
After the 'sunroof' incident they went through and added a few hundred rivets and some external "shielding" to hold the things together. It's easy to take aircraft safety for granted until you've ridden on one of these bulletproof wonders.
You knew exactly how bad it was a few years ago when they got all excited about getting some 'new' -200's into the fleet. These ended up being someone elses very tired hulls which were still ~25 years old.
Lihue1k