I going to fly from LHR to PPT on AirNewZealand (I need to combine a deep-discounted fare with a stopover in LAX, I usually go there on AZ/AF/TN), so I'm going to join StarAlliance, betraying SkyTeam.
My question is: Is there any substantial difference in subscribing through one airline or another? If so, which one would you suggest me?
Any reply would be greatly appreciated, thanks.