Quite clearly TBM you do not understand the concept of ownership of shares. Shareholders do not guarantee an organisation's debts. You seem to think that by the NZ Govt holding the shares, that this transcends into some form of debt guarantee that lenders feel happy with.
Wrong. Shareholders provide the capital, are there as investors, and when you look at the returns the NZ Govt has extracted from it's ANZ shareholding, you would have to say it was quite an astute move in retrospect.
Almost. The Export-Import Bank of the United States provides cheap credit facilities to Boeing customer airlines, it is designed to assist US company exports. Generally, these airlines have to government backed/owned or investment credit rated. ANZ has used the Export-Import Bank for aircraft financing.