Definition
A NOTAM contraction meaning indefinitely — used to indicate that a condition, closure, or restriction has no scheduled end time and will remain in effect until further notice.
Plain English
It means there is no end date set. The condition stays in place until someone officially cancels or changes it.
Context Anchor
Seen in NOTAMs and other short aviation notices where space is limited and standard contractions are used.
Derivation
Short for the English word 'indefinitely.' NOTAMs use compressed contractions to save space in teletype-style messages, so 'indefinitely' becomes INDEFLY.
Why Pilots Care
Pilots must know whether a closure or limitation has an announced end date or continues without one to plan flights safely.
Intuition Check
Do not read INDEFLY as meaning “forever.” Read it as “no definite end time has been published yet.”
Example Sentence 1
The NOTAM stated that Runway 14/32 was closed INDEFLY for pavement repairs, so the pilot planned to use Runway 09/27 instead.
Example Sentence 2
The VOR will be out of service INDEFLY for maintenance.