Definition
A general term for the commercial telephone service provider whose landline circuits are used to connect aviation facilities, such as Flight Service Stations, control towers, or remote communication sites, to the wider voice and data network.
Plain English
The phone company — the regular landline provider that supplies telephone lines to aviation facilities.
Context Anchor
Seen in NOTAMs, airport notices, or maintenance notes when telephone service at an aviation facility is unavailable, being repaired, or involved in a communication problem.
Derivation
A short form of 'telephone company,' built the same way as words like 'memo' from 'memorandum.' It dates from the mid-twentieth century when phone companies were a distinct industry referred to often enough to need a shorthand.
Why Pilots Care
When a TELCO outage is reported, services that rely on phone lines — such as a remote frequency, an automated weather broadcast, or a clearance delivery line — may be unavailable, even though the facility itself is otherwise working.
Intuition Check
TELCO does not mean an aircraft radio, a controller, or an aviation agency. It means the telephone service provider or the telephone service they maintain.
Example Sentence 1
The NOTAM advised that the AWOS was out of service due to a TELCO outage.
Example Sentence 2
Airport operations contacted the TELCO after a landline failure delayed weather updates.