Media Advisory - MDA's First Quarter 2009 financial review alert and 2008 Annual General Meeting

    RICHMOND, BC, April 21 /CNW/ - MacDonald, Dettwiler and Associates Ltd.
(TSX: MDA), a provider of essential information solutions, plans to release
its First Quarter 2009 financial results on May 5, 2009 at 9:00 a.m. Eastern
Time / 6:00 a.m. Pacific Time.
    Later in the day, MDA will be holding its Annual General Meeting at 1:30
p.m. (Eastern Time) at The Suites at 1 King West Hotel, (Toronto, Ontario),
followed by a strategic business update including the First Quarter 2009
financial review with Daniel Friedmann, president and CEO and Anil Wirasekara,
executive vice-president and CFO, followed by a Q&A session.

    Agenda for the day:

    9:00 a.m. ET / 6:00 a.m. PT    First Quarter 2009 financial results
    1:30 p.m. ET / 10:30 a.m. PT   Annual General Meeting (no participation
                                   via conference call)
    2:00 p.m. ET / 11:00 a.m. PT   Strategic business update including
                                   First Quarter 2009 financial review
                                   conference call / question and answer

    The conference call will not include the Annual General Meeting. To
participate in the conference call, please call the conference line
approximately five minutes prior to the commencement of the call:

         Toll free - In Canada or the United States: 1-888-789-9572
                           In Toronto: 416-695-7806
                             Pass Code: 2560715

     The conference call will also be Webcast live and then archived at:

    Telephone replay will be available until May 12, 2009 at the following

                  Toll free - International: 1-800-408-3053
                           In Toronto: 416-695-5800
                             Pass Code: 5643440

    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
    Focused on markets and customers with strong repeat business potential,
MDA delivers a broad spectrum of information solutions, ranging from complex
operational systems, to tailored information services, to electronic
information products.
    MDA employs more than 3,200 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:

    Forward-Looking Statement
    This release and the associated earnings conference call and webcast
contains certain forward-looking statements and information, which reflect the
current view of MacDonald, Dettwiler and Associates Ltd. ("MDA") with respect
to future events and financial performance and are based on MDA's current
expectations, estimates, projections and assumptions made in light of its
experience and its perception of historical trends. 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. You are referred to the risk factors described in MDA's most
recent annual Management's Discussion and Analysis, Annual Information Form
and other documents on file with the Canadian securities regulatory
authorities, available online at or The
forward-looking statements and information contained in this release, and the
associated earnings conference call and webcast represent MDA's views only as
of the date of this release, and the associated earnings conference call and
webcast. MDA disclaims any intention or obligation to update or review any
forward-looking statements, whether as a result of new information, future
events or otherwise, other than as required by law, rule or regulation. You
should not place undue reliance on forward-looking statements.

    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)

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