Even when Joe L. was CEO the talk at recurrent was the ridiculously low lease rates on 757's and what we could do with those. Maybe you missed it, but even little Sun Country was planning proving runs to Stanstead ... in 737's!
Yes, with stops in Gander after starting in MSP. The main reason they were doing that was to get ETOPS approval for eventual MAC contracts. But, they are doing it again this upcoming summer once a week, from Gatwick this time (via Gander too I believe).