No -- it means that if you add up the hours of experience the two men have, it's almost 20,000. So maybe one has 15,000 hours of experience, and the other has 5,000. It doesn't say anything about whether or not they were working together for any of that time.
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vsuresh(They have worked together for such a period of time.)No. Each has flown many hundreds/thousands of hours. If you add Evgeny's total number of flying hours to Andrey's, the total will be nearly 20,000 hours. We have no real idea of whether or not they have ever flown together before, though the reference to the four-man flight crew suggests that