Wondering if any folks have experience with B6 code-share flights, specifically with HAL. Is it better to purchase a flight from say Boston to Honolulu in pieces - Boston to LAX via B6 and then LAX to Honolulu from the HAL site, or better to purchase it code-shared from B6? I travel light so don't plan on checking luggage, so the advantage of having a checked bag going all the way to the destination isn't that important. On the other hand, I would like to be able to choose my seat, and on the B6 site it appears that I can't choose a seat for the code-shared HAL portion... and that I'd have to wait until the day of the flight to get one assigned, at which point the nicer seats may be gone. Also, as a Mosaic, I wonder if I end up wanting to make a change - would my benefits in terms of being able to cancel the flight or make a same-day change 24 hours in advance without a fee still apply to the Hawaiian part? And finally, is a layover of one hour between flights in LAS/LAX and HNL sufficient? It looks like B6 and HAL share the same terminal at both airports (T3 in LAS and T5 in LAX). Thanks for any insights.

Welcome to FlyerTalk!

Most important question is how much does the codeshare flight cost versus buying without the codeshare?

I would not expect same-day change to work on partner-operated flights but I'm also not certain of it.

A 1 hour connection in either is tight but fine. Not a lot of flexibility if things go pear-shaped. I'd angle for LAX over LAS given more onward flight options if that's a concern.

SDC is only valid with JetBlue operated segments.

You can select your seat directly with HA in advance, you just need your HA PNR.