BOS to ACK. The new JetBlue promotion works just the way it sounds:Buy two round-trips or 4 one-way flights between Boston and Nantucket for travel between May 17 and July 9, and complete your travel between May 17-July 9. Around July 13, the carrier will e-mail you two travel certificates, good for a round-trip or two one-way flights between Boston and Nantucket. you must book and travel July 16-Aug. 30 -- Friday or Sunday travel excluded.
Here are all the details.