Incident
at PETERBOROUGH ON (CYPQ)
(TCAS alert, Conflict - potential)
C-GVXA (CMM377) AIRBUS A320-212 CANADA 3000 AIRLINES LIMITED IFR from Toronto (LBPIA) to Montréal International (Dorval) Airport UAL1255, IFR from Burlington International Airport, VT (U.S.A.) to Chicago (O'Hare) International Airport, IL (U.S.A.), was westbound at FL280 when the flight crew received a TCAS RA and climbed approximately 400 feet. CMM377 was eastbound, climbing to FL270 from FL260, approximately five (5) miles north of UAL1255 at the time of the alert. Both flight crews advised that they received a TCAS alert. NAV CANADA noted that CMM377 was abeam or east of UAL1255 when UAL1255 was observed to climb out of FL280. SSR codes: - UAL1255: 2032 - CMM377: 2211 S.O.B.: - UAL1255: 75 -- five (5) crew, 70 passengers; and - CMM377: 175 -- seven (7) crew, 168 passengers. O.P.I.: PAS