I'm traveling from Perth to SFO on February 1st. I'm currently a silver frequent flier. I've got 45,000 points, but I have access to maybe 150,000 more points from family.I'd like to book this as cheap as possible, but I'd also love to upgrade to business class.I would love suggestions on how best to approach this.Thanks a lot,LachyP.S. Crosspost from FT