I fly NYC-LAS a few times a year and I'm going to have 22,500 MQM's by the end of December. Is a mileage run of 2,500 (at a cost of over $300 rount trip) worth it for silver medallion status? i.e. Does silver typically get upgraded on JFK-LAS (mid-afternoon) or LAS-JFK (red-eye)? Thanks.