The code 7700 is a general emergency signal for aircraft. Code Adam This is an alert for a missing child that’s used in many public locations like malls, hospitals, supermarkets, and museums.

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Code words like "oscar" are used to alert crew members of emergencies without causing mass panic. Other terms, like "babaloo" and "mamagayo," are used to describe annoying guests or employees.

Flight attendants use specific words and phrases to indicate emergencies -- ranging from hijackings to missing children -- sans frightening passengers.

The coded words directly pointed to the likelihood of a significant al Qaeda attack against an overseas U.S. installation, according to a U.S. source familiar with the latest intelligence.