plane's disappearance? at this point, there's still more questions than answers. joining me are captain john cox, a retired airline pilot, and jim cavanau cavanaugh, an nbc law enforcement analyst, who's been deeply involved in many high-profile investigations, including the unabomber case. thank you both for being on the show tonight. >> thanks, reverend al. >> my pleasure. >> captain, malaysia airlines officials believe the co-pilot was the last one to talk to air traffic controllers. what would be the significance of that? >> there's really no significance in it. the flight crew members swap duties, depending on different legs, and that just means that the routine radio transmissions is were being handled by the first officer, fully qualified, and he's an experienced pilot. so this would be a very routine, normal event. >> now, jim, if you were leading this investigation, how intently