AC*SE is correct. The RWSTAR fares allow backtracking within the mileage constraints. As for eticketing it - who cares if you can or can't - I'm a bit confused about this. I don't see why UA couldn't eticket a *A fare if it was all on UA as suggested (eg: SAN-ORD-IAD-LHR-DEL-HKG-SIN-BKK-LAX-SAN).
As for this 10 day tule, that seems to come and go. I just ticketed and flew a *A RTW last week and did it in less than 10 days and never had any minimum stay requirements thrown at me (btw I think the 10 day minimum was only for Y class RTW's anyway, which mine was). It could of course be country specific.
As for flying to Mexico to start the trip - sure, you'd just get a seperate tix from NV to MEX, and then grab your first *A flight out of there, but remember you'd have to *return* to MEX at the end of your *A trip so your seperate tix would need to be a r/t of course. Is it worth it for the lower fare ex-mexico?
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UA 1P MEL (awaiting 1K
posting!)