CODE RED is used by the flight attendants to alert fellow crew members that a passenger is experiencing cardiac arrest and to grab certain medical equipment.
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For most airlines, the code serves as a short abbreviation for the company's full name. For example, American Airlines uses “AA” and United Airlines uses “UA.” Not all codes appear to be synonymous with an airline, though.
Flight code and numberThere's generally a simple formula for this one: two uppercase letters, followed by a four-digit number. The letters are the airline code, or the numbers universally recognized to represent the name of the airline in shorthand. Some are obvious—AA is American Airlines, for example.
The six-digit alphanumeric code that appears on your boarding pass is your PNR, or Passenger Name Reference—also known as your record locator, reservation code, or booking code.