Palo Alto, CA - Space Systems Loral (SSL) a leading provider of innovative satellites and spacecraft systems, today announced that it was selected to provide two high power satellites to SiriusXM, the world’s largest radio company measured by revenue. The next generation satellites, SXM-7 and SXM-8, will replace the XM-3 and XM-4 satellites in 2019 and 2020, respectively, and will help ensure continuous and reliable delivery of SiriusXM’s audio entertainment and data services to more than 30.6 million subscribers across North America.

“SiriusXM provides an unparalleled variety of audio entertainment for radio listeners in North America,” said John Celli, president of SSL. “We have a long history of working with SiriusXM to develop some of the world’s most advanced satellites which broadcast to cars and radios for the home, office, and mobile devices. We are honored to be selected to build two additional satellites that will reinforce and augment the fleet’s capability.”

Both SXM-7 and SXM-8 will operate in the S-band spectrum. Each satellite will generate more than 20-kW of power and will have a large unfurlable antenna reflector, which enables broadcast to radios without the need for large dish-type antennas on the ground.

SSL has previously built a total of seven satellites for SiriusXM, including its first generation Sirius satellites, which were launched in 2000. Of the seven satellites built, one was a ground spare that was never needed due to the reliability of the original constellation. It was donated to the Smithsonian Air and Space Museum in 2012.

“We are pleased to once again collaborate with SSL on two advanced satellites that will bolster service to our subscribers for years to come,” said Bridget Neville, vice president of satellite and terrestrial engineering and operations at SiriusXM. “SSL is a premier designer and manufacturer of reliable communications satellites, with the technological capability to meet our demanding requirements. We look forward to working together on the new satellites.”

SXM-7 and SXM-8 are based on the powerful SSL 1300 platform, which has the flexibility to support a broad range of applications and technology advances. The satellites are designed to provide service for 15 years or longer.

About SiriusXM

Sirius XM Holdings Inc. (NASDAQ: SIRI) is the world’s largest radio company measured by revenue and has more than 30.6 million subscribers. SiriusXM creates and offers commercial-free music; premier sports talk and live events; comedy; news; exclusive talk and entertainment, and a wide-range of Latin music, sports and talk programming. SiriusXM is available in vehicles from every major car company in the U.S. and on smartphones and other connected devices as well as online at siriusxm.com. SiriusXM radios and accessories are available from retailers nationwide and online at SiriusXM. SiriusXM also provides premium traffic, weather, data and information services for subscribers through SiriusXM Traffic™, SiriusXM Travel Link, NavTraffic®, NavWeather™. SiriusXM delivers weather, data and information services to aircraft and boats through SiriusXM Aviation, SiriusXM Marine™, Sirius Marine Weather, XMWX Aviation™, XMWX Weather, and XMWX Marine™. In addition, SiriusXM Music for Business provides commercial-free music to a variety of businesses. SiriusXM holds a minority interest in SiriusXM Canada which has approximately 2.7 million subscribers. SiriusXM is also a leading provider of connected vehicles services to major automakers, giving customers access to a suite of safety, security, and convenience services including automatic crash notification, stolen vehicle recovery assistance, enhanced roadside assistance and turn-by-turn navigation.

To download SiriusXM logos and artwork, visit http://www.siriusxm.com/LogosAndPhotos.

About SSL

Space Systems Loral (SSL) is a leading provider of commercial satellites with broad expertise to support satellite operators and innovative space related missions. The company designs and manufactures spacecraft for services such as direct-to-home television, video content distribution, broadband internet, mobile communications, and Earth observation. As a Silicon Valley innovator for more than 50 years, SSL’s advanced product line also includes state-of-the-art small satellites, and sophisticated robotics and automation solutions for remote operations. For more information, visit www.sslmda.com.

About MDA

MDA is a global communications and information company providing operational solutions to commercial and government organizations worldwide.

MDA's business is focused on markets and customers with strong repeat business potential, primarily in the Communications sector and the Surveillance and Intelligence sector. In addition, the Company conducts a significant amount of advanced technology development.

MDA's established global customer base is served by more than 4,800 employees operating from 13 locations in the United States, Canada, and internationally.

MacDonald, Dettwiler and Associates Ltd.’s (MDA)common shares trade on the Toronto Stock Exchange under the symbol "MDA."

Related Websites
www.mdacorporation.com

Forward-Looking Statements
This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. (“MDA” or the “Company”) with respect to future events and financial performance. The forward-looking statements in this regard include statements regarding the award of a contract. Any such forward-looking statements are based on MDA’s current expectations, estimates, projections and assumptions in light of its experience and its perception of historical trends. The factors and assumptions underlying the forward-looking statements in this release include contracts not being terminated. Any such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from current expectations. MDA cautions readers that should certain risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary significantly from those expected. The risks that could cause actual results to differ from current expectations include, but are not limited to: risks associated with operating a satellite including in-orbit failures or impaired satellite performance; failure of third parties and subcontractors; failure of systems to meet performance requirements; and failure to anticipate changes in technology, technical standards and offerings or compliance with the requisite standards..

For additional information with respect to certain of these risks or factors, plus additional risks or factors, reference should be made to the Company's continuous disclosure materials filed from time to time with Canadian securities regulatory authorities, which are available online under the Company's profile at www.sedar.com or on the Company's website at www.mdacorporation.com.

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