"Beginning May 1, 2012, Hawaiian will not through check bags to other airline flights unless the other airline segments are on the PNR for which the passenger is checking in.:
Seems like a really bad idea to me. Check in for a Hawaiian flight, check bags, clear security, take a short 20 minute interisland flight, pick up bags, tromp up to the check in counters, recheck with the next carrier (like Delta), check bags, re clear security.
I realize they are trying to get thier baggage fees on in bound flights but this seems like a really bad move and will add a huge amount of time to any flight not on the same PNR...assuming you can even book what you need on the same PNR.