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  • Plaque Celebrating Aviation History in Mount Dennis

    Saturday, July 15 - 10:45 am

    Hearst Circle and "The Wishbone" (Opposite Harding Park in Mount Dennis)

    Reception to follow at The Atrium, 12 Division Police Station, 200 Trethewey Drive, North York

    This event is a joint function of Heritage Toronto, CAHS (Toronto Chapter & National) and 400 Squadron Historical Society.  The plaque is honouring the airfield that hosted 1st flight over Toronto in 1910, the startup location of DeHavilland Aircraft in Canada in 1928 at this airfield and in 1932 the first operational base of the RCAF 400 "City of Toronto" Squadron as 10 Sqn and later 110 Sqn.

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    Background on the William G. Trethewey Property

    By Dr. Robert Galway

    This property was purchased by William Trethewey following his sale of two Silver mining properties that he discovered in Cobalt, Ontario on 1904. He and his brother Joseph O. Trethewey made millions in this transaction. William Trethewey came to Toronto and purchased 600 acres in Weston, near present day Jane St. & Lawrence Ave. in 1907 The Royal Automobile Club of Canada and the OML of which Trethewey was a member, asked for permission to use a portion of the property for an exhibition Air Meet. This took place July 9-16th, 1910 following closely on the heels of the initial Air Meet held in Pointe Claire, PQ.

    During the Toronto meet, French Aviator Jacques de Lesseps completed the first flight over the city of Toronto as he had done two weeks previously in Montreal. The Toronto flight occurred on July 13, 1910. This is the basis for recognizing Jacques de Lesseps on the Heritage Toronto Plaque that will be unveiled this summer on July 15, 2017.

    However, this is not the sole reason for recognizing the contribution that this plot of farmland made to Canadian aviation history.

    Following the Air Meet of 1910, the property became the center of early aviation activity in Toronto. Indeed, it became known as de Lesseps Field. In 1928 de Havilland UK decided establish a manufacturing center in Canada. They were persuaded to do so because of the success they had met in selling the DH60 Moth to the Ontario Provincial Air Service. In their search for a suitable property, they were put in touch with Frank Trethewey who had inherited the property on his father’s demise in 1926. Trethewey leased a parcel of the land to de Havilland and with the incorporation of de Havilland
    Canada was appointed to the DHC Board.

    Consequently, the Trethewey property became the first manufacturing site of de Havilland. In fact the first building used to assemble the DH60 series was the Trethewey Canning Shed made famous by the sketch completed by famous aviation artist, Robert Bradford.

    Frank Trethewey was given the opportunity to purchase DH aircraft at a significant “favored” price. He and his brother were RNAS veteran pilots. In the 1930's he was Chairman of de Havilland Canada.

    The establishment of de Havilland Aircraft on this property in 1928 is the second reason to grant historic recognition to this property.

    Frank Trethewey not only over time purchased three aircraft from DHC but went one step further and joined the RCAF. This led to the establishment of the RCAF Squadron 10/ 110 on Trethewey Field. Frank Trethewey was one of the first four flying officers appointed to the Squadron. In 1940 he was appointed commanding officer of Base Trenton.

    The squadron was formed in October 1932 as 10 (Army Cooperation) Squadron and began flying in 1934 at the Trethewey Farm airfield (aka de Lesseps Field) in Toronto. In April, 1935, the City of Toronto adopted the squadron which then became officially known as “10 (City of Toronto) Squadron”. In 1937, the squadron was re-designated “110 (City of
    Toronto) Squadron”.

    The squadron flew five basic types of aircraft, all biplanes, from Trethewey until late 1939 when it deployed to Rockcliffe. During the Trethewey era, the squadron was involved in recruitment and flight training. At Rockcliffe, the squadron underwent conversion to the Canadian-built Westland Lysander until mid-February 1940. The squadron then deployed to the UK as the first RCAF squadron to enter the Second World War.

    In the UK, the squadron was initially equipped with the Lysander III and was involved in the Army Co-op and photo reconnaissance role. The squadron was active in the Dunkirk evacuation (27 May - 3 June 1940) but not directly involved in the Battle of Britain (10 July - 31 Oct. 1940). In mid-1941, the squadron was re-designated “400 Squadron”.

    Today, the Squadron is located at Camp Borden and is the main maintenance centre for maintenance of the RCAF's Tactical Helicopter Squadrons.

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Journal Submission Guidelines

The CAHS Journal is published four times a year and strives to include content representing all aspects of Canadian aviation history.

We welcome content both from CAHS members and people outside the society who want to be published in Canada’s most prestigious aviation history periodical.

At this time we unfortunately cannot offer payment for articles, photos, and stories.

What We Are Looking For

  • Feature-length articles (up to 6,500 words)
  • Shorter articles (1,700 words to 3,000 words)
  • Canadian aviation history book, film, and other media reviews
  • Profiles of important Canadian aviation figures and aircraft
  • Pictorial features based on photography, art, or other historical imagery
  • Articles that mark the anniversary of an important aviation history event*
  • Articles that offer a new interpretation or newly-discovered information on significant events and people

Please Note: Queries for time-sensitive articles (such as ones that mark an anniversary) must be submitted at least 6 months before that date so the editor can work it into the editorial calendar

Submitting Your Work for Publication

Please do not submit unsolicited original material, manuscripts or research. We cannot be responsible for their return.


  • Become familiar with the Journal by reading recent back issues
  • Discuss your idea with the CAHS Journal editor by emailing a short query. We will make every effort to personally respond to your queries.
  • If your idea is accepted, you and the editor will agree upon a deadline for a first draft
  • The editor will do an initial check of the article and may discuss possible revisions with you
  • You and the editor will discuss photo and other illustrative submissions for resolution, formatting, method of delivery, etc.
  • The article may go to CAHS fact-checkers for peer review
  • You and the editor may approve a final draft of the story (if required)
  • You will be asked to submit a short biographical note that will identify your expertise to readers
  • You will need to sign a CAHS permission form agreeing to publication and distribution of the work


General Guidelines

  • Texts should be in Canadian English and double-spaced
  • For research-based pieces, we require proper citing of sources. Please follow the Chicago Style Manual and use footnotes instead of endnotes.
  • Submissions must be made in digital form by e-mail. Please use word-processing software such as Microsoft Word (Macintosh or Windows), WordPerfect (Windows), or Pages (Macintosh). Please save text files as .doc and not .docx.
  • If you are submitting a book review, please follow the format below and include a scanned image of the cover (300 dpi or better):
    Great Circles: The Keith Greenaway Story
    By Kathy Berquist
    Hardcover with laminated dust jacket
    315 pp. 5.75 x 8.75 inches, $20.00
    ArtBookbindery, Ottawa, ON, 2008, ISBN 978-0-xxxxxxxx

What to Include In Your Query

When proposing a story idea, you should submit:

  • A brief outline and synopsis of your idea
  • A list of sources you expect to use
  • Proposed length and type of article
  • A short note about previous writing experience and any special qualifications you bring to your subject
  • Suggestions for, or examples of, illustrative material (photos, drawings, artwork, etc.)