Near Miss Between Two Boeing 767s West of Langruth, Manitoba

Incident Overview and Separation Loss On a flight from Toronto to Vancouver, Canadian Airlines International Flight 987 (CDN 987), a Boeing 767, was operating at flight level 390. Simultaneously, Air Canada Flight 118 (ACA 118), also a Boeing 767, was flying from Calgary to Toronto at flight level 370. Approximately 55 nautical miles west of the Langruth, Manitoba, VOR, ACA 118 requested and received clearance to climb to flight level 410. Shortly after, the pilot of CDN 987, located about 35 nautical miles west of the same VOR, informed the controller that the aircraft was climbing out of flight level 390 in response to a traffic alert and collision-avoidance system (TCAS) resolution advisory (RA) for traffic straight ahead. A loss of separation occurred when the two aircraft passed within 3 nautical miles horizontally with less than 1,000 feet of vertical spacing, falling short of the required 5 nautical miles horizontal or 2,000 feet vertical separation.