Both the airline and hotel industries use discreet code words to communicate sensitive situations without alarming the public. On a plane, "Code Adam" is a high-priority alert for a missing child, while "Code Yellow" refers to a non-life-threatening medical emergency. "Deadheading" refers to crew members traveling as passengers to their next assignment. You might hear crew refer to "Pax" (passengers) or "Gate Lice" (passengers who crowd the boarding area before their group is called). In hotels, "Skipper" refers to a guest who leaves without paying, and "P.I.P." stands for a "Person in Progress" (a guest currently checking in). In 2026, "emergency" codes remain vital: "Code 300" or "Angel" can be used by crew to signal a death on board or a serious security threat. Even subtle phrases like "Hot Coffee" are sometimes used among crew to point out a passenger they find attractive or a situation requiring extra attention without using formal, potentially disruptive language over the PA system.