These "rules" you refer to are in regards to the carrier's Contract of Carriage. Although a "rule" might be stated, it can often be ruled out as an option.

For example, if a flight is running late, the carrier can "Rule 240" you to another carrier. The other carrier will accept the ticket and bill the airline directly. That's all, there is no "requirement" as the word "rule" may imply at times. Why do I say this? In most cases, the carrier can deem itself not liable. This includes, but is not limited to, mechanical delays.

[This message has been edited by Miles Man for more clarity of his statement(edited 02-19-2000).]

[This message has been edited by Miles Man (edited 02-19-2000).]