1. Travel

aka Force Majeure

From , former About.com Guide

Definition: Act of God - also known as a `force majeure'.
This encompasses situations where airlines are not legally responsible to provide lodging, transport, or other expenses that travelers may incur as a result of an AOG. Inclement weather, civil disruptions, and other unanticipated events may be classified as an AOG.

Sometimes is also used to state the Aircraft is On the Ground - when an aircraft urgently needs some sort of maintenance on the ground when it is supposed to be in the air.

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