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Specifically they run IBM zTPF on their mainframes, which is also used by airlines. Some installations have uptimes measured in decades.

https://www.ibm.com/it-infrastructure/z/transaction-processi...

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It's rarely the hardware that fails, it's more often due to software. So I wonder what the software that's running on mainframes does differently than the software that's written for ordinary computers.

> So I wonder what the software that's running on mainframes does differently than the software that's written for ordinary computers.

Not change.

May it's not what it does but that it is written in COBOL?

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