sentences:  Bristow Helicopters
  
  Bristow Helicopters Limited is a British civil helicopter operator originally based at Aberdeen Airport, Scotland, which is currently a part of the U.S.-based Bristow Group (, S&P 600 component) which in turn has its corporate headquarters in Houston, Texas, US.Bristow Helicopters was established by Alan Bristow in June 1955; two years later, it acquired its first pair of helicopters in the form of the Westland Widgeon.