We have a couple of related threads with info for AA flyers when traveling on AS and BA:
http://www.flyertalk.com/forum/ameri...-aa-elite.html
http://www.flyertalk.com/forum/ameri...aa-flyers.html

So, I thought I'd share a few notes on our HA interisland experience here. Hopefully others will contribute additional info and we can put this in the wiki.

General
HA interisland flights can be booked as AA codeshares when connecting from an AA flight, and accrue EQM, EQP, and RDM. HA flights can also be booked under HA flight numbers via AA, but will only accrue RDM. AA elites do NOT receive any benefits when traveling on HA (other than being in Hawaii ).

Itineraries Containing AA*/HA Codeshare Segments (new)
As noted downthread, keep a proactive eye on itineraries that contain AA-marketed segments operated by HA (AA*/HA), and probably on those that contain native HA-marketed/operated segments as well. Automatic reticketing may not proceed properly when a waitlisted upgrade clears or there is a schedule change.

HA Confirmation Code
The HA confirmation code will be 6 letters, and is different from the AA PNR. The HA confirmation code can be obtained by entering the Ticket Number and Passenger's Last Name in the Manage / View Reservations page of Hawaiianair.com, and is needed to view updated seat assignments (the AA.com reservation page is static and may not reflect actual HA seat assignments) and for online checkin (not available for AA codeshare flights).

Seating
HA flies Boeing 717-200 aircraft on interisland flights, which are the successors to the MD-80 aircraft flown by AA (after McDonnell Douglas merged with Boeing in 1997). These aircraft have the same 2+3 seat configuration in coach, but are a bit shorter than AA's MD-80s, with 26 rows total and exit rows 16 & 17.

When we booked our AA codeshare flights, we were assigned 11A/B by default, which were the first non-preferred seats from the front of the cabin. However, as I reported in the thread below, it's a good idea to keep an eye on these seat assignments in HA.com, as we were later bumped from these seats, either due to a computer glitch or to make more room for HA elites:
http://www.flyertalk.com/forum/ameri...-airlines.html

I'm not sure if it's possible to request different seat assignments by calling HA customer service, but we were unable to select different seats online at HA.com.

Our two flights flew just off the south coasts of the islands both ways (non ETOPS?), so seats on the left were great for HNL-KOA, while seats on the right were better for KOA-HNL. HNL prevailing winds are from the East, while KOA had both North and South arrivals while we were there. For more seating advice, see this thread in the HA Forum:
http://www.flyertalk.com/forum/hawai...-mainland.html

Check-In and Baggage Fees (rev. 9/15)
We were unable to check-in online or via airport kiosk on our AA codeshare flights. We waited about 15 min in the line to check in with an agent at HNL and only 2 min in the line at KOA.

HA charges baggage fees for interisland and mainland flights, currently $10 now $25 for the first checked bag and 17 $35 for the second checked bag and $100 each for a third and fourth bag; these fees apply to First class as well. The standard 62 linear inch & 50 lb limits apply. AA elites are NOT exempt from these fees. If you are connecting to an AA flight to the mainland, you will be charged the interisland baggage fees. However, hillrider notes that recent DOT regulations mandate that, for codeshare flights, the baggage rules of the Marketing carrier apply, not those of the operating carrier. So AA elites should be exempt from baggage fees on HA flights booked as AA codeshares – not all HA agents are aware of this rule.

HA also limits carry-on bags to 45 linear inches AND 25 lbs. While our carry-on bags were not weighed at HNL, we got a stickler of an agent at KOA who weighed our rollaboards. As our scuba regulators and lights put them well north of 35 lbs, we had to pull our regulator bags out and check the rollaboards as second checked bags.

Lounge Access
AA elites and Admirals Club members do NOT have access to HA lounges. However, the HNL joint Admirals Club / JL Sakura Lounge (see here) is accessible when traveling on interisland flights as all gates are connected airside at HNL.

Boarding
HA preboards handicapped passengers & families with children under age 2, then first, then HA elites, then coach by row (>20, >15?, >10, >4). Even though we boarded in the last group for our HNL-KOA flight, we still had room for our rollaboards in the overhead bins.

In-Flight Service
On these short interisland flights (all <1 hr), service consisted of a container of juice or water, with alcohol for sale. The crews were friendly and efficient, and went out of their way to point out good views of the islands or sunset during the flights.

Connections
Be sure to see this excellent main thread in the HA Forum:
http://www.flyertalk.com/forum/hawai...5-03-09-a.html

Baggage Claim
We claimed checked bags at both HNL and KOA and they arrived promptly on the carousel after our flights - much better speed than AA on the mainland!

AA Mileage Accrual
As discussed in other threads, the fine print in the AA elite guides provides only for 250 minimum miles when traveling on AA codeshare flights operated by HA. Accordingly, we received 250 EQM, 250 EQP (V fare), 250 MTEU for our flights, although we received 500 RDM instead of 250.

Non AA codeshare flights booked under eligible fares are supposed to accrue RDM only, based on actual miles for non-elites, 250 minimum RDM for AA elites.