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It seems there is no requirement to book on JetBlue.com:

Full conditions:


*2X Base Point Offer Terms: You must register for this promotion at http://www.trueblue.jetblue.com/web/.../springforward prior to booking eligible travel. Offer valid only for JetBlue flights (one-way or roundtrip) that are purchased 3/2/2017-3/23/2017 and flown 3/2/2017-4/30/2017. TrueBlue number must be entered at time of booking. New bookings only. TrueBlue members generally earn three (3) points per dollar spent on the base fare of their individual JetBlue flight as the base TrueBlue point offer. JetBlue flights are flights operated by JetBlue and purchased under a JetBlue flight number. Six (6) Base Points are awarded on the base TrueBlue point offer, meaning that Members qualifying for this offer will earn 2X TrueBlue points per dollar spent on the base fare of their individual flight, and these Six (6) points per dollar will count as “base flight points” for purposes of earning TrueBlue Mosaic. Points will be earned on the base fare of the flight only. Points will not be earned on government taxes/fees, travel insurance or other fees or charges (e.g., change/cancel fees, etc.). Offer not valid for previously booked flights or changes to a previously-booked flight. In the event you cancel your reservation, you will not receive any TrueBlue points from that reservation; in the event that you change your reservation so that it no longer complies with the terms of this offer, you will not receive any 2X Base Points; any points already awarded for canceled or changed reservations will be debited from your TrueBlue account. Offer does not apply to non-revenue travel (e.g., travel booked with a travel certificate, TrueBlue award flights, etc.); is not valid in connection with other routes, partner or codeshare or interline flights, JetBlue Vacations packages, cruises or any other product or service; may not be combined with other special offers; is not redeemable for cash; and has no cash value. TrueBlue account must be in good standing. All deadlines based on Eastern Standard Time. Please allow 4-6 weeks after the promotion period ends on for points to be posted to your TrueBlue account. Additional restrictions apply. TrueBlue Terms and Conditions apply.