Helicopter pilot reported that during landing at night they flew over an aircraft that was holding on the runway numbers and did not realize it until the aircraft pilot advised them. Reporter stated the aircraft had been not visible and there were no TCAS warnings observed during approach.

Narrative

On this date; I was conducting a landing on Runway XX at ZZZ while using Night Vision Goggles. We made a radio call while on a 2.5 mile final and 1 mile final with no response from any aircraft at the airport. I was conducting a shallow approach with a run-on landing. Our helicopter touched down about 1/2 down the runway and came to a stop. After we had landed; an aircraft identified themselves as a saratoga stated in effect that they had been holding on the XX numbers; and our helicopter had overflown their plane. We asked why they had not made any radio calls while we were on final; and their response was; 'does that make it OK to over-fly me.' We advised him that we had not seen him nor heard any calls to advise of his location on the runway. Both the SIC (Second in Command) and I had not noticed the aircraft. There were also no TCAS warnings observed or targets detected on our iPad. I observed the threshold of the runway during my initial scan and did not notice any aircraft. I then became focused on performing a run-on landing further down the runway. I believe that the aircraft's lights blended in with runway lights. Additionally; with NVG goggles on; the color contrast of the aircraft lights and the runway lights all looked the same; perhaps contributing to my failure to notice the aircraft. During the duration of our approach; the aircraft's position on the runway never changed; which also made it harder to identify.