Definition
A NOTAM contraction used to indicate the airline office at an airport — the on-field facility operated by an air carrier where airline staff handle operational, dispatch, or administrative functions related to that carrier's flights.
Plain English
Short code meaning 'airline office' — the place at an airport where a particular airline's staff work and handle the day-to-day business of running their flights from that airport.
Context Anchor
Seen in FAA acronym, abbreviation, and NOTAM contraction lists, and sometimes in written airport or flight-planning information.
Derivation
Formed by compressing 'AiRLiNe Office' into a short, unambiguous code. NOTAM contractions are built this way — keep enough letters of each word so the meaning remains recognisable while saving space in teletype-style messages.
Why Pilots Care
When reading a NOTAM that references ARLNO, the pilot needs to recognise instantly that the notice concerns an airline's office facility (for example, a closure or relocation) rather than a runway, taxiway, or navigation aid.
Intuition Check
Do not read ARLNO as a navigation aid, radio frequency, or aircraft part. In this context, it simply means airline office.
Example Sentence 1
The NOTAM reported that the ARLNO at the south terminal would be closed for renovation over the weekend.
Example Sentence 2
Messages addressed to the ARLNO were reviewed before the flight briefing.