The DL Y-Up fares are valid from YVR YYC YWG YOW and YYZ. All route through ATL-LIM on 767 D1 lie flat. Although you don’t get great redeemable miles, if you’re going for an MQM mileage run, the routing table is amazing. I booked YYZ-SLC-ATL-LIM-ATL-JFK-SEA-YYC-YYZ. The SLC-ATL is A330 DomF lie flat and JFK-SEA is 757 D1 domestic lieflat. Only economy segment is YYC-YYZ due to WS. Over 20k MQMs. If you’re looking for a 24 hour layover in New York, you can get one on most days (ITA Matrix). Approx 5 cpm and in J!