Brazil
In Brazil, after the Petrobras corruption scandal following the oil price dip they ended up cancelling many contracts and opted for high speed boats to transport passengers to many oil rigs in effort to reduce costs, not all of them, of course. Some companies here had the same or worse financial crises as CHC, although I don't think any of them filed for bankruptcy, they were either acquainted bigger players or ceased to operate. Many helicopters "left" the country as there was no work for them here.