Definition
A NOTAM contraction meaning 'until,' used to indicate the end time or end date of a condition, restriction, closure, or other notice affecting flight operations.
Plain English
TIL is shorthand for 'until.' It tells you when something stops being in effect.
Context Anchor
Seen in NOTAMs and other shortened aviation notices where space is limited and times must be stated clearly.
Why Pilots Care
When reading a NOTAM, TIL marks the cutoff time for a closure, restriction, or outage. Misreading it can lead to planning a flight around something that has already expired or, worse, treating an active restriction as already lifted.
Intuition Check
TIL points to an end time, not a start time. If a notice says TIL 1800, the condition applies up to 1800 unless another notice changes it.
Example Sentence 1
The NOTAM stated that Runway 27 would be closed TIL 1800Z for maintenance.
Example Sentence 2
METAR remarks may specify visibility restrictions TIL further notice.