by now, mckenzie was on her way to graybold, wyoming. tiny airport tucked behind a ridge, hard to see from the air, through the smoky haze. white-knuckle landing. the message you got, it wasn't as easy this time? >> right. she let me know she got a little disoriented, things went well, there and able to go ahead and taxi over, tie the plane down. take a little break. >> reporter: she texted she ate lunch, refuelled and because one runway was closed for repairs, she used an alternate runway, heading in a different direction. still, the last leg was the easiest. following big horn river over the yellow tail dam, make landings at the billings around and a final flight back to where bobbi was waiting. >> of course, i'm excited. we're really rolling. don't have far to go here now. closer to home. >> reporter: it was mid-afternoon now. mckenzie's mother hadn't heard from her for a while. and suddenly sensed something odd. >> i had that eerie feeling. the kind you don't entertain as a parent. >> reporter: her father driving to work tells it, to