All concerns being true, still, for oneworld I'd get the ticket issued from the cheapest airline possible, and if any news should arise, then I'd make some minor change to the itinerary and get it reissued on another carrier's stock at that point.

Historically, as long as a carrier operates -- even if they are in receivership -- their stock has always been honored (at least amongst any carriers of the status of oneworld carriers). The only questions arise if the carrier ceases operations entirely, at which point one could be at the mercy of the other carriers.

But even then, realize that a carrier like BA would probably have liabilities to the failed carrier (segments booked, flown, but not yet paid for in the past XX days), and that they certainly want to pay those liabilities by charging that account for flying you around rather than paying cash.

All in all, it's a good question, but not one I think we need to worry much about at the current time.

Steve