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- Northrop Grumman cargo ship reaches the International Space Station a day late after engine issue ca.finance.yahoo.com
- Engine trouble forces Northrop Grumman to delay supply delivery to International Space Station CityNews Halifax
- Northrop spacecraft’s ISS cargo delivery set for Thursday after software hiccup ca.finance.yahoo.com
- NASA, Northrop Grumman Assessing Cygnus XL Engine Burn Plan NASA (.gov)
- Northrop Grumman’s Cygnus XL cargo spacecraft suffers thruster issue on way to the International Space Station Space