New Zealand will lift coronavirus restrictions across the country on September 21, except in its biggest city, Auckland, which is the epicentre of a second wave of infections, Prime Minister Jacinda Ardern said on Monday.Ardern said Auckland’s restrictions would be reviewed next Monday. She also said the government would immediately ease all physical distancing requirements on planes, a boost for Air New Zealand, which has had to limit passengers on its planes for months.“I know this change…