The letter and number codes on a boarding pass tell a lot about you, including whether you've been chosen for extra screening. Here's what they mean.

Flyers are warned to avoid uploading photos of boarding passes online - or even discarding of them in public bins - as the PNR can give hackers a deep insight into your travel plans and habits.

Passenger Name Record (PNR) More commonly known as a booking reference or reservation number, a Passenger Name Record (PNR) is a six-digit alphanumeric code that appears on every boarding pass.

The letter and number codes on a boarding pass tell a lot about you, including whether you've been chosen for extra screening. Here's what they mean.

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But your boarding pass contains a lot more than just your plane seat and gate number. It also includes codes that communicate details about passengers and their itineraries to airport staff.

A boarding pass contains a lot more information than just your gate and seat number. Boarding passes include codes that identify details about passengers and their itineraries.