EMB ERJ 190/195 ER/LR
Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Human Factors
Level at 4;000 ft; and we got a TCAS RA. We advised ATC and he apologized for not informing us of traffic. A/C passed 400 ft above us. They were supposed to be level at 4;500 ft.
ERJ-190 Captain reported an NMAC with another aircraft in the vicinity of LGA.