All their children have 'flown the coop'. [=have moved away from home]
Her books are filled with abstract ideas and 'high-flown' language.
In the morning the suspect had 'flown the coop'.
(..) Patterson testified under oath, that he and his officers discussed repeatedly, in Clinton's presence, the large quantities of drugs being flown into Mena airport. Large quantities of money. Large quantities of guns. Hot Springs police officers would also record Roger Clinton, (..)2009 Loose Change 9/11: An American Coup