Sun Country leases several Transavia birds for the winter season, which is the high season for travel out of MSP as people wish to get away. These birds are already starting to head back to AMS and are cycling out of the fleet. As they cycle out, destinations are dropped. SY has a large charter network, the planes do not get as much downtime as one may think simply referencing the flight schedule.
Still, I'd have to think the "old" Sun Country I knew and loved would have done something for these people. But not the "rip out first class, pack coach like sardines, and start doing point-to-point ULCC flying" Sun Country. This sounds about right for the "new" Sun Country, and is the general nature of the ULCC world.
Yes, you said that... so prove it. When is the last time a "legacy" airline totally abandoned their passengers, making no provision at all to get them home from a destination? Absolutely no options... even a delayed flight?
Please enlighten us...
Considering AirBerlin and Westjet both have(well, had) feeder carriers and large networks, I'd consider them legacies. I've seen both have mechanical cancellations on the last flight of the season to SFO, and the reaction of both airlines was "lol sorry guys, see ya". Both of these carriers did not have the interline agreements one may have at a standard legacy.
That being said, it happens. United's(operated by Skywest but with United policies) SFO-MMH was a plagued route when it started. I rode the inaugural in and out...then the next THIRTEEN flights canceled! Flights had to land on one end of the runway, and takeoff on the other, so strong winds in either direction or low visibility for the non-precision approach and the flight was axed. Air returned more often than not the first season when it did depart. Well, guess what happened the last few days the flight was supposed to operate that season? Have fun driving 4-5 hours of windy mountain roads just to get to Fresno, and then on to San Francisco.