It may no longer be the case (have not flown these flights in 2015 or 2016) but there was a time when the AA-coded flight number on HA operated flights only earned 250 miles for the interisland flights. And it seems last time that happened to me it was not consistent - the EQM was still 500, but the RDM was capped at 250 - or vice-versa. The website used to have a disclaimer about it as well.