I just booked a reservation from IND-SFO-NRT-SIN & SIN-NRT-DEN-IND. I have <10,000 miles with United (and doesn't have status). The regular economy seats are terrible on the United flights, so I'm thinking of upgrading it. The more plausible option seems to be applying for the United MileagePlus to get the 30k needed, plus $600 to upgrade. I know this sounds really expensive, but if it meant a more comfortable flight, it just might be worth it! What do you think? Or should I just suck it up, and sit in the middle seat for 20+ hours. Thanks!