Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Human Factors
On descent into DAY as pilot flying about 7-5 miles from KEKEE and at 10;000 ft. while on the KEKEE3 the Captain and I were expecting a turn towards the left for the visual approach to 6L. We heard our call sign and were told to turn to heading 260. The Captain read it back and we turned to 260. We both stated that is was an odd heading to get but thought it was for the traffic we could see on TCAS. As we continued we got the TCAS caution of traffic. We were discussing the fact that we thought we would be getting a R/A [when] ATC called the traffic to us and told us the heading was not for us and that he had told us not to turn after we read it back.While that was happening the RA warning went off and I followed the instructions to descend as the Captain let ATC know we were descending because of the RA. ATC was handling aircraft on multiple frequencies. When clear ATC told us to maintain 9;000 ft. and turn to 360 heading. We were then cleared to a 5 mile final; called the airport in sight; and landed on 6L with no other issues.
[Report narrative contained no additional information.]
Air carrier flight crew reported they took a heading clearance for another company aircraft that resulted in a RA while on descent to DAY airport.