The Prime Minister is cagey about the possibility of a parliamentary exoneration for the pilots of the DC-10 that crashed into Mt Erebus.
The issue's resurfaced in a book written by Paul Holmes, who's spent two years investigating the events around the fatal flight piloted by Captain Jim Collins and First Officer Greg Cassin.
Holmes claims successive Governments have refused to officially recognise Justice Mahon's accident report which overturned assertions the pilots were at fault.
But John Key says it's difficult to re-visit historic cases - and this one is 30 years old.
He says you'd have to be very careful that in righting one wrong, you didn't create another.
