Maui Upgrades Do Exist
Last week I had an expiring $99 companion certificate to use; after some digging I found DEN-SEA-SFO (stopover) SFO-OGG (destination) OGG-PDX-SEA-DEN for late October. All segments had U space (for two) except for DEN-SEA. That leg is a 737-900 showing 0/16 booked in F so I'm confident it will open up. Good price and it's nice to not worry about upgrades clearing for the most part. Being flexible is key for us.