My last three trips on Delta I was boarding zone 1. I don't fly enough to earn status, I don't have the Delta Amex and I just purchase regular Economy tickets through my corporate travel agent. I do have Pre-Check but that is as close as it gets to any sort of "status". I am trying to figure out how I keep getting zone 1? Believe, I am not complaining at all, just curious if there is something I am not thinking of here?