Media Advisory - MDA'S First Quarter 2007 results conference call alert



    RICHMOND, BC, April 18 /CNW/ - MacDonald, Dettwiler and Associates Ltd.
(TSX: MDA), a provider of essential information solutions, plans to release
its First Quarter 2007 financial results at 5:00 p.m. Eastern Time (2:00 p.m.
Pacific Time) on Tuesday, May 1, 2007.
    MDA will host an earnings conference call, featuring remarks by president
and CEO, Daniel Friedmann and Anil Wirasekara, executive vice-president and
CFO, followed by a Q&A session.
    The call is scheduled to begin promptly at 5:30 p.m. Eastern Time
(2:30 p.m. Pacific Time).
    To participate, please call the conference line approximately five
minutes prior to the commencement of the call:

    
               In Canada or the United States: 1-866-898-9626
                           In Toronto: 416-340-2216

     The conference call will also be Webcast live and then archived at:
             http://www.mdacorporation.com/investor/events.shtml

    Telephone replay will be available until May 8, 2007 at the following
    numbers:

                  Toll free - International: 1-800-408-3053
                           In Toronto: 416-695-5800
                             Pass Code: 3220048
    

    About MDA

    MDA provides advanced information solutions that capture and process vast
amounts of data, produce essential information, and improve the decision
making and operational performance of business and government organizations
worldwide.
    Focused on markets and customers with strong repeat business potential,
MDA delivers a broad spectrum of earth and space based information solutions,
ranging from complex operational systems, to tailored information services, to
electronic information products.
    MDA employs more than 3,000 people in locations across the United States,
the United Kingdom, and Canada. The Company's common shares trade on the
Toronto Stock Exchange under the symbol TSX:MDA.

    Related Websites:
    www.mdacorporation.com

    Forward-Looking Statement
    -------------------------
    This release contains forward-looking statements and information, which
reflect the current view of MacDonald, Dettwiler and Associates Ltd. with
respect to future events and financial performance. Any such forward-looking
statements are subject to risks and uncertainties and MDA's actual results of
operations could differ materially from historical results or current
expectations. Additional information on these and other potential factors that
could affect MDA's financial results are detailed in documents filed from time
to time with the applicable Canadian securities regulatory authorities.

    The Toronto Stock Exchange has neither approved nor disapproved the form
    or content of this release.





For further information:

For further information: Wendy Keyzer, MDA External Relations, (604)
231-2743, wendy@mdacorporation.com


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