by now, mckenzie was on her way to greybull, wyoming. tiny airport, tucked behind a ridge, hard to see from the air through the smokey haze, white knuckle landing. the message you got was that it wasn't as easy this time? >> right. she let me know, you know, that she got a little disoriented but things went well, and she was on greybull. and she was going to go ahead and taxi over, tie the plane down, take a little break. >> she texted that she ate lunch, refueled 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. the flight plan called for mckenzie to follow the bighorn river, over the yellowtail dam, make her landings at the billings airport. and then a final short flight back to laurel, where bobbi was waiting. >> of course i'm excited. now we're -- you know, we're really rolling. we don't have far to go here now. closer to home. >> it was mid-afternoon now. mckenzie's mother hadn't heard from her for awhile and suddenly sensed something o