grizzly country. >> there's mountain lions, coyotes. it's not where you'd want to see yourself let alone a young girl. >> reporter: brian was in his super cub. a graduate of bobbi's flight school and he and all the pilots knew what might be waiting out there. >> i think that every person in the air had worst-case scenarios playing through their minds. >> reporter: mckenzie missing over an hour. there were nine small planes in the air scouring the ground. >> over to 1-22-75. >> reporter: over the radio agreed to divide the miles and miles of southern montana and northern wyoming into a grid. >> everybody -- was looking everywhere. i mean, there was guys heading north and south, east and west. >> someone would say okay i'm looking in the garvin basin. someone else, okay, i'm going to go look, you know, along the north rim of the canyon. >> you know, your head's on a swivel, looking, looking, looking. >> reporter: most of these pilots have been on searches before. they'd found plane wrecks, but rarely survivors. >> the whole time up there