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The concept of processive maintenance, a check, b check, c check, there that is more than likely universal throughout the industry. >> 79 models have been grounded for inspection. that translates into about 300 flight cancellations nationwide. the ntsb also at southwest headquarters in dallas, texas, pouring over the plane's maintenance records. the two black boxes have also been recovered. we are talking about the congress be pit voice recorder and the flight data recorder. those are already in washington, d.c. for analysis. shannon? >> all right, casey stegall, thank you very much for keepin...

It is accurate to say that most of the major airlines are using -- all of the major airlines are using a progressive maintenance inspection where things are looked at at various phases and stages. so i would say that the concept of progressive maintenance a check, b check, c check, that is more than likely universal throughout the industry. i will take two more questions, yes, sir? >> it is not uniform throughout all of the airlines. >> i tonight have information to say if that is uniform across all the airlines. i don't have that information. usually these programs are worked out in conjuncti...