• HS-2L's were contracted by the St. Maurice Forest Protective Association for timber surveying and forest fire spotting
  
  
• In 1919 Laurentide Co. became sole owner of aircraft, as others in association thought operation too costly
  
  
• In 1920, 34 fires were spotted and 543,000 acres of land were photographed
  
  
• In 1921 Stuart Graham resigned as manager and was replaced by William Roy Maxwell
  
  
• In 1921 Laurentide Co. decided that operations were too costly and offered Maxwell the option of starting his own company with the aircraft
  
  
• In 1922, with the backing of Thomas Hall a rich ship builder and well known aviation supporter, Laurentide Air Service Ltd. is formed
  
  
• That year 659 passengers were carried, and 688 hours and 20 minutes were flown. Much of the flying was surveying northern Ontario for the Department of Lands and Forests
  
  
• In 1923, 1,480 hours and 22 min. of flying time were accumulated
  
  
• In 1924 the province of Ontario formed the Ontario Provincial Air Service. Maxwell left Laurentide to become the director of the new service, taking many pilots with him
  
  
• That same year the first regularly scheduled flight service was established by Laurentide between Angliers and the gold fields of the Rouyn district
  
  
• On August 9th the Laurentide Air Service began, with permission from the Post Office Department, to sell air mail stamps. This was the first time this permission was granted in Canada.
  
  
• Due to the high cost of operations the Laurentide Air Service went out of business in 1924.

Ken Molson, a Canadian aviation historian of note, aptly summed up the importance of the Laurentide Air Service to Canadian aviation: "While the company did go out of business, it did establish the standards from which the traditions of air transport in Canada have started. Moreover its personnel spread throughout the Canadian aviation industry and, through them, its experience continued to benefit the industry for many years afterwards"