[jjm2111]

"Oh yes, I know, a job is guaranteed; that means that a top level executive manager in Air France returns to work after birthing her baby and finds herself working in the mail room.

A bit over the top. Maybe you won't be in control of the department, but you'll have the same title and pay.

[Ippolita]

Actually not over the top at all. This episode really happened in middle of the 1980's at AirFrance in NYC. I believe another freeper should be able to confirm it.
Nyer does it ring a bell?

Yes you keep title and same pay but what is the use of being CEO in a mail room? The lady in question quit her job and moved on to another corporation.