The problem with the bus, is 50 people checking in at exactly the same time. Depending on where you are staying, a taxi might only be $20-25 to SXM, a worthwhile investment if it means checking in before or after the crowds. Security screening can be a bit slow at SXM. Once you are airside, there are enough shops, icecream/coffee/sandwich stands to occupy a bit of time. There might even be a kids play area.
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