You can still click on the report post icon on the lower left corner and one of our supermods, who can work in all forums, can move it.

As to the initial question, it's a bit confusing. Are you saying the plane landed, but the passenger wasn't on board? In that case, I'd probably try the person on their cellphone and then try them at home or at work. Or are you asking if the airline would tell if the passenger in question ever checked-in for the flight? Or are you saying what if the plane never arrived, as in it crashed?