I just made a "backdoor" booking on Delta.com for an all-VN itinerary HKG-SGN-DAD. This was done by searching the flights in Matrix and then using
Powertools to book it on the site. Does anyone see this presenting a problem down the line? I needed to book it like this as I wanted to burn an eCredit that I had and also liked the fact that I'll get some MQMs out of the deal.