Want to travel from DTW to HNL in Feb. 2013, HNL to SYD in Mar. 2013, and return Sydey or Melbourne to DTW in late March / early April 2013. Looking for advice on booking Business class using . Best or most available airlines? In addition to Skymiles partners (will be using Delta miles), can partner code share airlines also be used. Want to use low level miles (150k RT, I think), of course. Would be willing to purchase separate ticket to gateway city to make easier. I know it is too early to book now, but how early can partner airlines be booked (based on availability, of course)?