Following the recent Bristow Helicopters Australia 85 percent controlling stake in North Australia's largest regional airline, Airnorth, there is talk that the number of direct fights between Darwin and Townsville are to be cut to three a week , instead of five, possibly due to impact of the wet season on activity in Top End . Bristow is a British civil helicopter operator based in Aberdeen,Scotland , part of the Bristow Group whose corporate headquarters are in Houston, Texas . Bristow is the largest provider of helicopter services to the Australian oil and gas industry. Airnorth, based in Darwin , with 13 aircraft,is the only regionally based Qantas code share partner, carries more than 350,000 passengers and services West Australian mining centres , NT settlements,western Queensland , Timor Leste and the Philippines . Bristow is involved in fixed wing operations worldwide with affiliates in Nigeria and Brazil and last year bought 40 percent of Eastern Airways in the United Kingdom .