The problem of high staff turnover is proving harder to correct.
The precision of the Brussels heist suggests extensive help from airport insiders, said air-security experts, who noted that all airports employ thousands of low-paid workers and face high staff turnover.
In the past, companies suffered from very high rates of staff turnover the average tenure of managers in Shanghai was barely 15 months.
London Midland apologised and said the cancellations were "predominantly due to recent high turnover of staff".
In particular, it revealed the regulator had a high turnover of staff - about a third were leaving each year - and was facing a backlog of 4, 500 cases dating back as far as seven years.
In other cases staff do not join existing schemes, typically because they are low paid and fear they cannot afford to contribute, or because they work in industries such as catering where there is a high turnover of staff who stay in jobs for only short periods of time.
They have a belief in themselves that, some say, results in high staff satisfaction and low employee turnover.
Last January's report had raised concerns about a number of areas, including staff turnover, high levels of reported violence, healthcare and the level of participation by prisoners in various activities on offer.
In fact, the Corporate Leadership Council reports that companies which enjoy high engagement rates have 87 percent lower staff turnover rates and 20 percent better performance.
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Matalin also raised an operational challenge for second-term presidents: high turnover in senior positions, from the White House staff to key Cabinet positions.
The watchdog warned that many hospitals had high levels of sickness as well as absences, vacancies and turnover of staff.
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