Originally Posted by
moa999
Generally not...
The rules governing any *ONE* RTW or equivalent are governed by the rules at the date of ticketing, which presently doesn't include MH.
That is what should be the case...I agree. If the endorsement box says something like "VLD ON AA/AB/AY... FLTS ONLY," it will be hard to later add MH in. However, if the endorsement box says "VLD ON ONEWORLD FLTS ONLY" and you happen to have a clueless agent, it may then be possible.