I'm looking at overseas flights and I noticed when I search from Kayak rather than DL.com, it's showing the cabin as Biz rather than economy for certain segments. Clicking through to DL.com shows the same thing. Fare class is Z. The non-BE flights are Y class. The price is what you'd expect from a low-bucket economy flight.

I went ahead and booked the itinerary. It ticketed and I was able to select seats in BE. One strange thing, however is that the prior to booking, DL.com said I'd receive 0 miles, 0 MQMs and '--' MQDs. I'm a little worried to call and ask about that. It's a long flight, but honestly I'd rather receive the miles/MQMs rather than be in biz for one leg.

Suggestions?