Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness
Conflict NMAC
General None Reported / Taken
Human Factors; Procedure
Near Miss on the COKTL 1 RNAV Arrival just prior to MEZKL at 12;000 ft. Near Miss on the COKTL 1 RNAV Arrival just prior to MEZKL at 12;000 ft. The other Aircraft was not talking to anyone. That was way to close. Lesson learned; Stay Alert; Alert; Alert.
Air carrier Captain reported a near miss during arrival into LAS.