I'm currently looking at booking my flights for October 8th, HYD-DXB-JFK. There is no Z availability to use miles to upgrade to first from DXB-JFK on that date. It's available the 9th, but I need to be back in NY on the 8th. I see that IAD, SEA, YYZ, and DFW have seats of upgrading, so do you think I should wait for JFK to becom available? I set an expert flyer notification. Or should I book one of the other destinations that are available? The only problem with doing that is that it's about $1000 more than booking JFK in J.
HYD-DXB-JFK-DXB-HYD: $4900
HYD-DXB-IAD/YYZ-JFK-DXB-HYD: $5900

So what do you think? SEA and DFW are a little too far, so what do you think about IAD/YYZ. The A380 is YYZ so I'm slightly leaning towards that, it's just the late arrival into Toronto compared to the 8:15am into IAD. I can easily quickly connect as I only have a carry on for this trip.

Give me your advice!

Thanks,
-ek202