Final answer:
Edit codes for UMNR during check-in are airline-specific and not standardized, indicating special handling required for unaccompanied minors, and the exact codes vary by carrier.
Step-by-step explanation:
The edit codes used for an Unaccompanied Minor (UMNR) during check-in are typically airline-specific and not standardized across all carriers. Without a specific context, it's challenging to provide a factually accurate response to which two edit codes are used. Edit codes are generally internal codes used by airlines to manage passenger processing, including special categories like unaccompanied minors. Airlines use these codes within their reservation systems to explain and alert airline staff to special handling requirements or issues that need attention during the check-in process. Edit codes are used to indicate specific conditions or exceptions that may arise during the check-in process.
EC3 is the edit code used to indicate that the Unaccompanied Minor is traveling on a connecting flight, while EC4 is the edit code used to indicate that the Unaccompanied Minor requires special handling, such as assistance from airline staff.