No, it's not going to fill any fields already filled in, even if they were imported that way. It's assuming your tail number is 320. It is behaving correctly in your scenario.So I think I figured out what is happening. I download my trip with the aircraft type filling the aircraft line. When the AutoFill does its job, it looks like it won't overwrite existing fields. If I delete the aircraft type, the N number will populate. Is there a way to do both?