Definition
An informal aviation shorthand for passenger or passengers — the people carried aboard an aircraft other than the crew. Commonly used in flight planning, weight and balance calculations, dispatch paperwork, and operational communications.
Plain English
PAX just means the people you are flying — anyone on board who isn't part of the crew.
Context Anchor
Seen in aviation shorthand such as flight planning notes, load information, dispatch messages, NOTAM contractions, and passenger-count references.
Derivation
PAX is a long-standing shorthand from the travel and shipping industries, where 'P' stood for passenger and 'X' was added to make a pronounceable, distinct three-letter code. Aviation adopted it because it's quick to write, fits on forms, and avoids being confused with other abbreviations.
Why Pilots Care
PAX count drives weight and balance, fuel planning, seating, and emergency briefings. Getting the number wrong can put the aircraft out of limits or leave someone unaccounted for in an emergency.
Intuition Check
Do not read PAX as a separate technical system or piece of equipment. It simply means passenger or passengers.
Example Sentence 1
The load sheet showed 4 PAX and 120 pounds of baggage, well within the aircraft's weight limits.
Example Sentence 2
Dispatch listed the total PAX count on the flight release.