My view is the same people who complain about helicopter noise, find the sound of a helicopter coming down the valley the sweetest sound in the world when they have a broken leg three days walk from civilization. Slightly off topic but… A company I used to work for quite frequently flew climbing party’s into mountain huts, one guide in particular used to use our company helicopters to get to the hut and then he would complain about helicopter noise (to the authorities) when he was climbing! What a W@#$er