Pilot/Controller Glossary

ESTIMATED (EST)

This reproduces published FAA reference text for study. It does not replace the current official FAA publication or regulation.

When used in NOTAMs “EST” is a contraction that is used by the issuing authority only when the condition is expected to return to service prior to the expiration time. Using “EST” lets the user know that this NOTAM has the possibility of returning to service earlier than the expiration time. Any NOTAM which includes an “EST” will be auto-expired at the designated expiration time.

Retrieved from ecfr.gov on July 18, 2026.