The secret codes airline staff don't want you to know

Ever seen an airline worker spout incomprehensible gibberish into a walkie-talkie? It's not actually incomprehensible at all.

Airport staff, cabin crew, and the pilots all have secret codes and lingo that they use which enables them to talk to each other around passengers without revealing any information they'd rather keep under wraps.

Some codes are used in emergency situations, while others are just used by employees for shorthand purposes.

A similar system is used on the London Underground.

Take a look below to see what all the enigmatic language reportedly means.

Code Adam: alerts staff to a missing child. Named in honour of Adam Walsh, a child who was abducted in a department store

Code Bravo – most codes are used to avoid causing alarm to the public, but Code Bravo is used in order to deliberately cause panic, thereby making it easier to eliminate the threat without interference. Employees will all shout "code bravo!" if they want to cause alarm deliberately

7500: indicates the plane has been hijacked, or has a hijacking is a threat

7700: a general emergency code

7600: a radio failure

The whizzer: the Auxiliary Power Unit, an engine at the back of the plane which powers things like air conditioning and lighting when the main plane engines aren’t running

The heavy pilot: additional pilots which are sometimes present on longer flights, so that pilots can swap over and take a break

The director: air traffic controllers who control when planes land in a busy airport

The sin bin: an area where a plane has to wait to make room for another aircraft on the runway if it cannot yet take off

Tracks: highly populated routes between Europe and north America

All call: all flight attendants must report via their intercom, used when checking emergency exits and slides on the plane

Flight level: how many feet above water you are. This works as a unit of measurement, the ‘flight level’ will be the number of feet divided by 100, so flight level three zero zero means 30,000 feet above the water

EFC time: when a plane can take off after being held on the ground for any reason

Ramp: also called the apron, the area where the aircraft is parked closest to the terminal

Blue juice: the toilet water on the plane

Crew juice: a cocktail consumed on the way to the hotel to help sleep after an overnight flight

Crotch watch: the seatbelt check

Deadhead: flying on the plane as a passenger, not working the flight

Furlough: when a plane company downsizes, they sometimes give you a ‘furlough’ which means that if they start hiring again they have to offer you your old job back before hiring new people

Pax: passengers

Slam-click: when a crew member goes to the hotel and stays there until it’s time to fly again e.g. “I’m exhausted, I’m going to slam-click” or “she won’t come out with us, she’s a slam-clicker”

Coach roach: a cabin crew member who prefers working in coach rather than higher airline classes

Sources: Mail, Telegraph and Quora