What does IOR stand for?

• A. Irregular Operations Report
• B. Incident Operational Report
• C. In-Flight Occurrence Record
• D. Irregular Organizational Report

Answer: (A)

Irregular Operations Report is the term used in airline operations to document events that disrupt the normal flight schedule. When a flight is delayed, canceled, or diverted due to weather, mechanical issues, airspace restrictions, or other irregular conditions, an IOR is filled out to capture what happened, what actions were taken, and any follow-up needed. This formal record supports safety reviews, root-cause analysis, and improvements to procedures.

The other phrases don’t match the standard aviation terminology. An Incident Operational Report suggests incidents rather than the broader category of irregular operations; a In-Flight Occurrence Record sounds like a different type of flight-event log and isn’t the established acronym; Irregular Organizational Report would refer to internal organizational matters rather than actual flight operations.