We have found Silver very good, and especially like their new planes. We have neighbors whose experiences have not been so good. Unfortunately your options are limited. Cape Air no longer sells their coupons, so it's full fare only. InterCaribbean has periods of abominable service. Tradewinds has a very limited schedule to Beef.
Have you contacted Delta to see if they have a ticket all the way to Beef, maybe in premium economy? At least that way your luggage will be transferred. Unless you're traveling carry-on only, you will need to pick up and recheck your bags.
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