Narrative:

It is my opinion that we had made our departure CTAF broadcast at the same time as aircraft Y and that caused us to not hear each other. We had observed 3 different aircraft using runway 17 (our inbound aircraft; a departing airline flight and an arriving airline flight) and elected to use 17 in effort to not disrupt flow of traffic. Leaving ZZZ we taxied to runway 17 from the terminal ramp making 2 CTAF calls en route; one for taxi and one for crossing 31/13. At the end of the runway I called center via phone to obtain clearance as stated by NOTAM and got clearance after confusion over call sign since ours was missing on our release paperwork. After 15 minutes or so we were released by center. I looked down the runway and saw no traffic and asked the captain if he was ready. He replied yes and I made a CTAF call saying 'ZZZ traffic; [callsign]; departing runway 17 with a right turnout; ZZZ' (the right turnout was misspoken). We observed no traffic and had heard no radio calls from anyone other than an ops vehicle that appeared to be inspecting runway 31 (does not intersect 17). We waited for approximately 15 seconds before we took the runway as we completed the before takeoff checklist. I once again called clear right while looking down the runway and observing no traffic. On the roll I was given flight controls and advanced power. As rotate was called I noticed a light on the departure end of the runway. We took off normally and flew the ZZZ1 departure; and during initial climb I noted aircraft Y on the 1000 foot markers for runway 35. At this point we heard a CTAF call from the aircraft but I do not recall the exact wording from the other aircraft. We briefly communicated with the other aircraft before swapping to center and continuing to ZZZ2.I believe us stepping on each others broadcast caused us to miss one another's departure call. The departure end of 17 has buildings that made it somewhat more difficult to spot traffic and the sun was in our face towards the departure end of 17.

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Original NASA ASRS Text

Title: Air carrier flight crew reported that during the takeoff roll and initial climb; an aircraft attempted to depart from the opposite end runway. The other aircraft aborted the takeoff.

Narrative: It is my opinion that we had made our departure CTAF broadcast at the same time as Aircraft Y and that caused us to not hear each other. We had observed 3 different aircraft using Runway 17 (our inbound aircraft; a departing airline flight and an arriving airline flight) and elected to use 17 in effort to not disrupt flow of traffic. Leaving ZZZ we taxied to RWY 17 from the terminal ramp making 2 CTAF calls en route; one for taxi and one for crossing 31/13. At the end of the runway I called Center via phone to obtain clearance as stated by NOTAM and got clearance after confusion over call sign since ours was missing on our release paperwork. After 15 minutes or so we were released by center. I looked down the runway and saw no traffic and asked the Captain if he was ready. He replied yes and I made a CTAF call saying 'ZZZ traffic; [Callsign]; departing Runway 17 with a right turnout; ZZZ' (the right turnout was misspoken). We observed no traffic and had heard no radio calls from anyone other than an ops vehicle that appeared to be inspecting Runway 31 (does not intersect 17). We waited for approximately 15 seconds before we took the runway as we completed the before takeoff checklist. I once again called clear right while looking down the runway and observing no traffic. On the roll I was given flight controls and advanced power. As rotate was called I noticed a light on the departure end of the runway. We took off normally and flew the ZZZ1 departure; and during initial climb I noted Aircraft Y on the 1000 foot markers for Runway 35. At this point we heard a CTAF call from the aircraft but I do not recall the exact wording from the other aircraft. We briefly communicated with the other aircraft before swapping to Center and continuing to ZZZ2.I believe us stepping on each others broadcast caused us to miss one another's departure call. The departure end of 17 has buildings that made it somewhat more difficult to spot traffic and the sun was in our face towards the departure end of 17.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.