Best to ask United this question.
And it never hurts to ask in Spokane, either. See if they can tag them all the way through.
I've never put any bags through the agriculture check upon arrival ... only on the way back to the Mainland. Traveling interisland ... no ag checks necessary.
Ok, not a "formal" agriculture inspection, but remember that cute little Beagle dog, walking along, on and over luggage on the carrosel? He(or she) is sniffing for agricultural stuff.
Once, as he was doing his sniffing, he stopped right in front of me, sat down, and looked up with his big, pretty eyes. He had found the banana in my pocket I had leftover from the plane trip. I had to give it up. Chuck.Edited: 14 February 2014, 03:09
Definitely see if United will check your bags all the way through. But, Hawaiian really doesn't want to interline bags, as they don't want the responsibility if the mainland airline loses them.
Quite a while ago I read that Hawaiian didn't want it because of lost revenue if you didn't pay for their bag fees.
If it was booked separately as implied above I would expect to have to claim and recheck the baggage, paying the relevant fees in the process. If you were booked through on one booking you would not have to pay extra bag fees at HNL... but as noted would be a good idea to ask the airlines anyway. UAL doesn't charge extra for checked bags, within limits, for first or business class, but of course does for economy.
You can also pose this question to the airline gurus on the air travel forum on here.
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