Date: 201811
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Haze / Smoke
Light: Daylight
Aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight phase: Takeoff / Launch
Airspace: Class E ZZZ
ATC / advisory: CTAF ZZZ
Second aircraft: Small Aircraft; Low Wing; 2 Eng; Retractable Gear
Reporter function: Pilot Flying
Reporter qualification: Flight Crew Commercial
Human factors: Communication Breakdown
Second reporter function: Pilot Flying
Anomaly: Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Detector: Person Flight Crew
When detected: In-flight; Taxi
Result: General None Reported / Taken
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: After startup at airport; I taxied out; making radio calls on CTAF as I went. I said I would be taking Runway YY; left turnout for [destination]. Meanwhile; there was Aircraft Y taxiing along the runway; taking the parallel taxiway. Since I was at the beginning of the runway; I took the runway; lined up and started my takeoff roll. The Aircraft Y did not stop; it pulled out into the runway; at taxiway Delta near the opposite end. Because I was near rotation speed at this point; I did not hesitate; just continued the takeoff. Unfortunately I did take off over the top of Aircraft Y. There was a lot of room; I felt it best to not abort the takeoff; and so flew on out. I felt I could have shown better 'defensive driving.' I never made radio contact with Aircraft Y; could have done a better job at making sure they knew I was taking off. Never again will I assume the other pilot knows I'm there.


Second narrative: After loading passengers aboard for [the] flight; passengers were briefed. I announced 'ZZZ traffic; [aircraft] on the ramp taxiing for a Runway XX departure for ZZZ1;' electing to do so as I thought the sun would be slightly behind me on roll-out rather than in my eyes; and the haze which was on the east end of the runway 30 minutes earlier had mostly dissipated but still over the river east of the airport.I double-checked the AWOS ensuring it concurred that the visibility was better than 10 and not reporting the haze present prior; and again before entering the runway announced CTAF that we would be back taxiing at Delta (intersection) for a XX ZZZ departure for ZZZ1. I looked east on the runway checking for traffic and noting the weather; squinted with the sun; looked west; saw nothing of threat; looked east again and back-taxied on XX Shortly before turning around for take-off we heard an aircraft roaring above us on an easterly heading. I saw an aircraft overhead; immediately tried to contact them but didn't hear a reply. I checked my radios -- I was transmitting on CTAF with the volume up; and AWOS was back in the back-up position on radio #2 which was now listing (Company frequency). I watched the aircraft turn out to the west. Keeping them in sight I departed Runway XX; stating again that we were headed for ZZZ1; and had the other aircraft in sight. I finally heard the other aircraft state it was headed for ZZZ1; and I reasserted that I had it in sight; and that I would follow it to ZZZ1. When we switched frequencies to [other CTAF] and the other aircraft made a call on that frequency; the call came through poorly and broken. I stated that the call was breaking up; and the other pilot stated some difficulty with the transmit button that day.ZZZ has a 'new' Runway YY/XX. It's 1000's of feet shorter than the previous ZZ/AA; and now requires back-taxiing from any entry point to utilize the full length of the runway for takeoff. I thought I'd picked the best and safest runway for flying to ZZZ2; which is west of ZZZ1; due to the sun; and potential haze east of the airport. I hadn't heard any other traffic at the airport after Aircraft X taxied out before I loaded passengers. I knew it was bright from the relatively low sun shining on the Delta taxiway to the runway; as it would've been at Bravo for Runway YY; but I thought I'd checked appropriately for traffic. Nothing about the flight was rushed or hurried. In hindsight I think about the 'Watch for Motorcycles' bumper stickers that come out every spring; and will personally incorporate a longer look for traffic. ZZZ has a lot of pilots that generally communicate very well with each other; and maybe that 'faith' led to some complacency or expectation that anyone present would communicate. I realize that communication at that airport; while advised; is not required; and I feel thankful that I get the opportunity to realize and remember not all aircraft may self-announce; whether taking off or landing.


Synopsis: Two pilots reported lack of communication between them resulted in a conflict.