The Office in which the Chief Pilot sits. Except its not just his office, but all of flight operations is now called the CPO.
Example:

“Hey I’m looking for the Chief Pilot’s Office.”
“His office is in Flight Operations. What do you need to see him for? Are you in trouble?”
No we just need to go to Flt Ops.”
“Why didn’t you say that in the first place?”
by UnitedBusDriver April 18, 2020
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