John Donly News Today

A jury our that will not take into consideration his service, respect, familiarity and expertise in the area. >> his testimony was compelling but may fall short of what zimmerman need to counter the emotional testimony of trayvon martins mother. >> the truth, so help you god? >> yes. >> you heard screaming or yelling, do you recognize that? ? >> yes. >> who do you recognize that to be, maam? >> trayvon martin. >> he considers george zimmerman his son. unlike trayvon martins mother, he is not fam...

>> how do you open that? okay, did you look at your briefing card? do you know how the exit opens? >> i dont know. >> did you know there was an exit behind you? >> no. >> reporter: in 20 second i made three common mistakes that could me and others killed. in little rock, 134 out of 135 people surp vifd. including one man who scrambled out with the seat still on his back. >> he crawled away from the airplane. it wasnt up tintil he got to t area he realized he hadnt unfastened his seatbelt. >> whe...

Who yelled for help on the 911 call is truly at the center of the trial, center of guilty or innocent or guilt yef verdict. a parade of witnesses, friend of george zimmermans testified it was george zimmerman not trayvon martin yelling for help on the tape. >> do you know whose voice that is in the background screaming? >> yes, definitely. georgie. >> i thought it was george. >> george zimmermans voice. >> can you identify whose voice that was yelling in the background? >> georges. >> how do you...

Tape is absolutely george zimmerman, sir. >> reporter: john donly, a long time close zimmerman friend and also a former vietnam vet, a combat medding with experience identifying screaming voices. >> you know the men you are with. you know the men that you eat, sleep with, you know who it is going to be before you get there. >> you can tell that from hearing their voice screaming for help and comparing that to what you heard in your everyday life with them? >> yes. >> reporter: when he turned his...

>> reporter: we got exclusive access to their training center in 2009 and spoke to nora marshal who led the human performance and factors di vgs of the ntsb. >> tell me about it and how you want you - tell me about the myth and how you will disspell it. >> these days one key roone you can make it out. equipment enhancements. >> we have improved the chance of survival by improving seat strength. by building airplanes that can with stand crash forces. >> reporter: fake a look at the inside of the ...

Captain weiss, flew a 777 for a year for american airlines. one of the questions here was how people landed. how they were sitting in their seats. you heard about so many injuries being back injuries, spinal injuries of compression. do you know how to survive a crash at landing? 305 people made it out alive saturday. a miraculous turn. six people in critical condition. there are those still fighting for their lives. investigators say survival is not as uncommon as most think. brian todd is out f...