Well said Thegypsy - at the current price (NZ$0.35) Air NZ shares are mighty cheap. When SIA wanted to buy more than the 50% that they are allowed to (and the Kiwi government said no) the price was NZ$1.30 per share. They renaged on this deal (ungentlemanly conduct??) - if the price had gone up would the board of Air NZ asked for more? As it is they have caused turmoil here and this has led to (at least in part) to the collapse of Ansett.
You could say - keep all your eggs in one basket, because spreading your investments like this is just causing havoc worldwide.
Interestingly, on a recent documentary here, the Ozzie government, who refused SIA permission to take over Ansett, and refused Air NZ the right to fly internally in Aus (like QA do here on a limited basis), were blamed as being the perpretators of the demise of Air NZ and Ansett, and SIA as saviours. The Aus govt. was seen as protecting QANTAS