Couldn't find any info as re the likelihood of these upgrades going through in practice. I'm buying a one way ticket LHR-IAH. A full fare Y on Air NZ LHR-LAX (plus tack on in cheapo Y to IAH) is significantly cheaper than a B fare on CO LHR-IAH in mid-June.

For mid-June, which do you think would be more likely to actually result in the upgrade? CO Gold, if it matters.

I know that the *A upgrades are by segment - I don't care, just want to get state-side in J, and don't mind going out of the way for a nice J product like NZ's+extra miles.

I've asked this on the NZ forum to no avail.

Thanks!