They used the A321 into BOH last winter. From the CAA site passenger numbers have been fairly steady:
2004/5 3,280 (B736) average 137
2005/6 3,897 (B738) average 162
2006/7 3,740 (B738) average 156
2007/8 3,877 (A321) average 162
Average pax numbers assume 13 weeks (as it will be in 2008/9) giving 24 flights (the first inbound and last outbound being empty positioning flights).
LT