I would like to book through Hawaiian Airlines with cash a coach ticket that has three legs: JFK > LAS > HNL > LIH. I’d like to upgrade to first using 50,000 Hawaiian points. The first leg from JFK > LAS is a JetBlue codeshare. I can’t seem to get a straight answer from HA on whether I can upgrade all three legs (which would mean JB Mint for the first leg) using the 50,000 point upgrade. Would appreciate any thoughts!